Porthos Porthos was Captain Jonathan Archer ' s pet Beagle . ( ) One of four puppies in a litter , Porthos and his brothers were named after the main four musketeers from the Alexandre Dumas novel " The Three Musketeers " : Porthos , Athos , Aramis and . Porthos and his brothers were born to a female dog owned by the mother of one of Archer ' s ex - girlfriends . Archer was crazy about the dog and was the first person she called after the dog got pregnant . ( ) History . 2150 . Porthos lived with Archer on Earth in mid - 2150 . ( ) In the same year , Archer was selected to command the starship . ( ) 2151 . When Archer moved aboard " Enterprise " in April of 2151 , he took Porthos with him . Shortly before the vessel departed Earth , Lieutenant Malcolm Reed discussed the ship ' s transporter with Ensign Travis Mayweather near the craft ' s transporter platform . Reed was slightly worried when Mayweather told him that the transporter had been approved for bio - transport , but the ensign assured the lieutenant that , from what he had been told , the captain wouldn ' t even use the contraption on his dog . In the captain ' s ready room , Porthos lay with his head on the floor but his legs and torso resting on a mat , while Chief Engineer Charles " Trip " Tucker talked with Captain Archer . Tucker jokingly told Archer that he would be more comfortable with Porthos on the bridge than with the new Vulcan science officer , Sub - Commander T ' Pol . Hearing this , Porthos lifted his head up from off the floor and looked towards Archer . After T ' Pol entered , she smelled a scent that disgusted her and glanced at Porthos , realizing that the dog was producing the repulsive odor . Porthos looked back at her shortly before Archer realized that T ' Pol , with her sensitive Vulcan sense of smell , was particularly offended by the dog ' s scent . As T ' Pol talked with Archer , Porthos climbed half - way up her leg , wagging his tail excitedly . This encounter made T ' Pol flinch and she quickly left the room . Shortly thereafter , Porthos was in the captain ' s quarters while Archer made a log entry . The captain paused the log several times to rhetorically question himself and Porthos about T ' Pol ' s motives . After " Enterprise " completed its first mission , Archer was attending to Porthos in the captain ' s ready room when T ' Pol and Tucker entered . Porthos sat beside the captain on a large seat , wagging his tail . He licked around his mouth a few times before Archer lifted him down to the floor so that the captain could speak to the officers . ( ) Around this time , Denobulan Doctor Phlox provided T ' Pol with a nasal numbing agent to protect her from the worst of Porthos ' offensive smell . ( ) In May of 2151 , Porthos was again in Archer ' s quarters as the captain made another log entry . While Archer paced back and forth across the floor , Porthos followed on the captain ' s bed . He was desperately attempting to acquire a piece of cheese that the captain was holding . Archer paused the log entry to reproachfully remind Porthos that he had previously suffered problems digesting cheddar cheese . However , the captain ultimately gave into the dog ' s pleas . Archer rubbed Porthos behind his ears and resumed the log . Before the captain left his quarters with Ensign Hoshi Sato , Porthos quietly barked . Archer looked round to see the dog sitting upright , wagging his tail and gazing expectantly at the captain . When Porthos whimpered , Archer reluctantly tossed him another piece of cheddar , informing the dog that it was " the last time " . Porthos jumped to catch the cheese in midair and gratefully chewed the snack . ( ) " Enterprise " soon visited a planet that later became known as Archer IV . ( ) Porthos traveled to the planet in a with a team from " Enterprise " . He was the first to exit the shuttlepod , bounding out of the craft and racing across the grassy surface of the planet , essentially wasting no time in " going " – as Commander Tucker put it – " where no dog has gone before " . When Archer whistled for the dog to return , Porthos obediently rushed back to the captain and his officers . The team from " Enterprise " then decided to separate , with Porthos joining Archer , Tucker , and Ensign Mayweather . The dog ran beside the Human s as they leisurely explored the planet . Porthos eventually raced ahead of his companions to the edge of a small boulder overlooking a stream . He gazed at his surroundings as the Humans took up a position directly behind him and contacted the other members of the team . They soon began to leave the area and Porthos followed them back to the shuttlepod . It was decided there that Archer and Porthos would return to " Enterprise " while the others would stay on the planet to conduct research and enjoy shore leave . ( ) Archer later fed Porthos dog food while talking with Commander Tucker using subspace communication , as the engineer was aboard a damaged Xyrillian starship . ( ) Shortly thereafter , a group of Borothan pilgrims were hosted aboard " Enterprise " . Archer entered his quarters after returning from the ship ' s mess hall to find Porthos barking and whimpering . The captain rubbed the dog behind his ears and assumed Porthos was upset that his breakfast was already two hours late . Archer consequently began to prepare a meal for Porthos , telling the dog that he had also missed his own breakfast . However , Porthos continued to bark and the captain eventually realized that something else was wrong . Archer told Porthos that he wasn ' t getting any cheese as the captain gave him a bowl of dog food . The Beagle moved away from the food to hide behind Archer and growled at something on the other side of the captain . While Porthos kept snarling , Archer noticed a Borothan robe on his desk . He realized that his pet Beagle had been attempting to warn him that Silik was using his Suliban camouflage ability to hide unseen in the room . Archer tried to contact ship ' s security , but was stopped by Silik . After they talked , Silik shot the captain with a Suliban disruptor . Porthos barked in distress as Archer fell to the deck and Silik left the room . Once the Suliban had gone , Porthos whined while he scampered over to Archer ' s fallen body and licked the captain ' s face . ( ) Following Archer ' s recovery , the captain and Commander Tucker took Porthos for a walk in September of 2151 . The group left from the captain ' s quarters and traveled through a corridor to an intercom that Tucker calibrated . As Porthos stood waiting for the Humans , Archer told him to sit . The dog complied with the instruction and continuously wagged his tail . Porthos followed when Archer and Tucker resumed their journey through the corridor . The Humans entered the mess hall together but soon left when T ' Pol contacted Archer with news of an imminent emergency . In engineering , Archer recalled that he had risked the lives of the entire crew by rushing " Enterprise " out of spacedock . Tucker reminded him that the life of his dog had also been jeopardized and Archer sarcastically replied " " Thanks " " . ( ) Shortly thereafter , Captain Archer took Porthos to see Dr . Phlox . While the dog sat on a biobed , Archer and Phlox viewed the animal ' s stomach using a computer monitor . Phlox diagnosed Porthos as having mild gastrointestinal distress . As Archer approached the dog , he commented that Porthos hadn ' t been himself recently . The Beagle moaned softly when the captain began to rub behind his ears . Phlox explained that the noted difference in the dog ' s behavior was a result of Archer feeding Porthos cheese . The doctor advised Archer to learn how to deny Porthos what he wanted . The captain relayed the news to Porthos , telling the dog that he was no longer allowed dairy products . Phlox injected Porthos with a hypospray before Archer picked the dog up from the biobed and into his arms . While the captain stroked behind the dog ' s head , he apologized for bothering Phlox . The doctor replied that analyzing the dog ' s condition was no bother and remarked that Porthos had been one of his most co - operative patients on that particular day . As Archer lifted Porthos down to the floor , the captain thanked Phlox . Archer and Porthos headed toward the exit as the captain asked the dog , " " See all the trouble you cause ? " " The strong relationship between Archer and Porthos later inspired Phlox to note in a letter to Dr . Jeremy Lucas that Humans surprisingly tended to make intimate bonds with ' lesser ' creatures . Phlox was also amused by Archer ' s habit of anthropomorphizing and even talking to Porthos , although the doctor was fairly certain that the dog could not understand English . Phlox then recalled how he himself had occasionally talked to his Pyrithian bat and realized that speaking to animals was not so strange as he had initially thought . ( ) When a group of Ferengi marauders rendered the " Enterprise " crew unconscious and boarded the ship , one of the alien s named Grish attempted to establish communication with Porthos through a universal translator . After failing to lock onto the dog ' s language , Grish ' s cohort , Muk , deduced that Porthos was a lower lifeform and called Grish a fool . Although Muk suspected that the animal was probably the captain ' s next meal , Grish argued that the size of the dog ' s ears suggested otherwise . Muk informed his accomplice that he would be able to acquire several bars of gold - pressed latinum for Porthos at the Malurzian Zoo . Muk picked the dog up from off Archer ' s bed and held him in mid - air while Grish left with another Ferengi marauder named Ulis . Muk subsequently carried Porthos to the launch bay and placed him inside a cargo container . Once the crew regained control of the ship , Archer released Porthos from the cargo container and rubbed the dog ' s head , playfully asking if he was okay . ( ) While a Kantare female named Liana visited the ship , Commander Tucker gave her a tour of the vessel . In engineering , he told her about T ' Pol , Phlox , and Porthos . Liana did not understand what a dog was , as she had never seen one and the word had no equivalent in the Kantare language . Tucker therefore described Porthos as a mammal with four legs and big ears . The engineer also commented that the dog was slightly " cute " . When Liana asked what Porthos did , Tucker replied , " " Not much – he ' s the captain ' s pet " " . Liana understood the word " pet " and realized her mistake . She asked Tucker if she could see the dog , as she was unfamiliar with the creature . ( ) 2152 . In early 2152 , Porthos was lying on a cushion in Archer ' s quarters when he sensed an alien symbiotic lifeform move through a Jefferies tube above the room . He looked up at the ceiling before licking the point of his nose as he quickly moved off the cushion . He then jumped onto the captain ' s bed and , balancing on his hind legs , began to bark at the ceiling . ( ) In February of the same year , Archer was lying on his bed and playfully massaging Porthos ' head when T ' Pol solemnly entered the captain ' s quarters . Archer held Porthos in his hands and started to gently rub the dog as he asked T ' Pol if there was something wrong . When she replied that she had spoken to V ' Lar , a visiting Vulcan ambassador , Archer lifted Porthos on to his bed and instructed the dog , " " Go on " " . Porthos then walked to the edge of the bed and jumped down off it . ( ) On February 12th , Archer recorded a log entry concerning the crew ' s forthcoming shore leave on Risa . Porthos lay on the cushion next to the captain ' s bed and watched as Archer made the entry . When T ' Pol contacted the captain from the bridge , he paused the log to answer . She notified him that " Enterprise " was receiving an incoming distress call and asked whether the bridge crew should alter their course to investigate the emergency . Archer was at first hesitant but eventually replied positively . After closing the communication channel , Archer told Porthos that his walk on the beach would probably have to wait . Aware that his owner was talking about the walk , Porthos barked softly as he jumped up to a sitting position . After Archer left the room , however , Porthos seemed disappointed and depressed . He tucked one leg under him and lay back down . ( ) Six days later , " Enterprise " finally reached Risa . Porthos yipped as he walked through a corridor beside T ' Pol and Archer . The captain looked down to check the dog was safe . Satisfied that Porthos was fine , Archer turned his attention to T ' Pol and discussed the next two days in which he and his dog would be away . When the group arrived at a turbolift , T ' Pol and Porthos entered the lift and waited for Archer to follow them . The captain cocked his head at Porthos before walking into the lift . They traveled to the launch bay , where Archer held Porthos in one arm . The captain talked with Ensign Sato and Crewman Rostov before leaving the ship with Porthos in a shuttlepod . On the way down to the planet , the vacationing officer s discussed their plans for the next two days . Archer revealed that he and Porthos were going to relax at a small villa overlooking the Risian ocean . When the captain mentioned Porthos , the dog jumped up on to its hind legs and placed its front paws on the captain ' s lap . Archer moved one hand behind Porthos and affectionately rubbed the back of the dog ' s head . After the captain and Porthos entered their villa , the dog stood on its hind legs near a table . Archer asked Porthos what he thought of the building and commented that the place was " not bad " . The dog looked at Archer as he intentionally dropped a water polo bag on a seat . The captain soon noticed a book from T ' Pol entitled , " The Teachings of Surak " , on the table near Porthos . When he put the book back down , Porthos moved away from the table . Archer quickly rubbed the dog ' s back and headed onto a balcony outside . That night , Archer read " The Teachings of Surak " on the balcony while Porthos lay on a chair next to the captain ' s seat with his head resting on his paws . When Archer got up to pour himself a drink , Porthos lifted his head to watch the captain leave the balcony . The dog dropped its head back to its paws but immediately bolted upright when it suddenly heard two loud , squeaky barks . As Archer poured his drink , he heard the barks mixed with similar noises coming from Porthos outside . The captain returned to the balcony , where he found Porthos with another dog , Rhylo , quite similar to an Earth Chinese Crested breed dog that he had previously seen on a veranda downstairs . As Porthos growled at the other dog , Archer told them both to stop threatening each other . Porthos barked and Archer reprovingly uttered the animal ' s name , but the dog kept growling . When the captain heard his front door chime , he picked Porthos up in his arms . The Beagle stopped growling after the captain lifted it away from the other dog . He then carried Porthos to the door , where he met Keyla Terrana , the owner of the other dog . She apologized to Archer for her pet ' s intrusion before he allowed her to retrieve the animal . Porthos watched the visitor as Archer rubbed his head and Keyla made her way to the balcony . The captain followed her outside while he continued to hold Porthos . Keyla picked her own dog up and stated that she hoped her pet had caused Archer ' s dog no harm . When the captain told her Porthos ' name , she said hello to the Beagle . The two dogs glimpsed at one another while their owners held and comforted them , occasionally rubbing the animals softly . Archer told Keyla that he had decided to read and to let Porthos run on the beach . The group went back inside before Keyla said goodbye to Porthos and left . Archer later discovered that Keyla was a Tandaran and believed that she was an agent of Colonel Grat . When confronted with this discovery , Keyla knocked Archer unconscious and disappeared . The next morning , Porthos licked the captain ' s face and he eventually regained consciousness . On the shuttlepod back to " Enterprise " , Porthos climbed half - way up Lieutenant Malcolm Reed ' s leg , sniffing and licking his limb . ( ) After a shuttlepod from " Enterprise " apparently caused the destruction of an alien colony , Archer sat in his quarters sadly looking at a computer record of the colonist s as Porthos sat in his lap . He gently rubbed the dog ' s ears but set Porthos down on the deck before answering an incoming call from Admiral Forrest . Porthos later lay on his side atop the cushion next to Archer ' s bed as the captain played with a yellow ball and a game of water polo was shown on the nearby computer monitor . T ' Pol entered and , while she spoke about the recent devastation of the colony with Archer , Porthos moved to lie on his torso . The captain bent down next to Porthos as he told T ' Pol that he was not only feeling sorry for himself but also for the entire Starfleet . The dog was still lying on the cushion after T ' Pol left . Archer had readied himself for bed and dressed down to his underwear . Porthos looked up at the captain as Archer told the dog that it was time for bed and rubbed behind its ears . After the captain lay down on his bed and switched the light off , he sighed and instructed Porthos to jump up to the bunk but nothing happened . Archer began to ask the beagle what was wrong as he reached for the light but stopped in mid - sentence when he realized he had been transported to an entirely different time and location : Earth , ten months into the past , to the night before Archer and Tucker ' s inspection by pod of " Enterprise " prior to launch for another test flight . Porthos was lying in a soft basket beside Archer ' s bed . He stirred as Archer answered a call from Commander Tucker . After the captain ended his conversation with the engineer , he looked at Porthos and declared that he doubted the supposed evidence that his time aboard " Enterprise " had been nothing but a dream . The dog soon sat up in the basket and watched Archer walk to a computer monitor on his desk . Porthos also moved agitatedly when , an operative from the future , suddenly appeared in the room . The captain ' s emotional attachment to Porthos was evident before leaving " Enterprise " for a Suliban Cabal vessel . His last order before he left the ship was for Ensign Sato to care for Porthos and to make sure that the dog had no cheese while he was away . ( ) After Archer returned , " Enterprise " journeyed to the Kreetassan homeworld and remained in orbit of the planet for five days . An away team consisting of Archer , T ' Pol , Porthos , and Ensign Sato eventually took a shuttlepod to the planet ' s surface and were made to wait there . Unknown to the members of the away team , Porthos was infected with a deadly pathogen on the planet . After the group had waited for twelve hours , the Kreetassans instructed them to return to " Enterprise " . The away team assumed that they had accidentally offended the Kreetassans and the captain was irritated by the aliens ' hypersensitivity but ultimately complied with their request and left the planet with his officers and Porthos . The Kreetassan pathogen necessitated Dr . Phlox having to replace his pituitary gland with that of a Calrissian chameleon in a complex underwater operation . Thanks to Phlox ' s skills , Porthos made a full recovery . ( ) 2153 . Archer also brought Porthos along when the " Enterprise " embarked on the search for the Xindi weapon . Tucker worried how Porthos would hold up in the Delphic Expanse , observing that " " if no people have returned from the Expanse , I doubt any dogs have . " " ( ) Porthos was able to sense the approach of spatial anomalies in the Delphic Expanse . Early in the Xindi mission , Porthos attempted to alert Archer of an imminent anomaly . The captain , however , did not understand the warning until after the anomaly had passed through his desk . ( ) After the operation , Phlox became quite fond of him , and Archer entrusted the Denobulan with Porthos ' safety on a number of occasions . Two of the most notable were when Archer volunteered to become a ritualistic sacrifice for the Triannon , ( ) and when Archer had to turn over control of the ship to Phlox as it passed through a region of space which negatively affected all Human crew members . While Phlox was the acting captain of " Enterprise " , he bonded with Porthos to a significant degree , and took time to make a casual study of Human - canine interaction . During this period with a " substitute master , " Porthos was unusually fed leech es and appeared to eagerly enjoy them . However , it should also be noted that Porthos appeared to chew the leeches before swallowing ; presumably in order to perform their cleansing function , the leeches needed to be alive and undamaged . ( ) 2154 . Phlox again looked after Porthos when Archer and the rest of the " Enterprise " crew had to be rendered comatose while the ship traversed a region of space affected by a transdimensional disturbance . However , it was revealed that Phlox ' s Denobulan physiology was not immune to the effects of the disturbance as he previously thought , and the doctor began to hallucinate to the point where he nearly shot Porthos with a phase - pistol . ( ) T ' Pol later learned to tolerate Porthos and even comforted him after Archer was apparently killed while destroying the Xindi weapon . ( ) After Captain Archer was found alive and " Enterprise " returned to Earth , the captain and T ' Pol were chased by a wild " sehlat " on . T ' Pol compared Porthos to a domesticated " sehlat " she had kept as a pet in her youth but Archer reminded her that , unlike the seemingly aggressive " sehlat " , Porthos would not try to eat the captain if he was late with the dog ' s dinner . ( ) Porthos later met Danica Erickson in Archer ' s quarters aboard " Enterprise " . Erickson wasn ' t told the dog ' s name , but she had learned a lot about him from Archer and correctly assumed he was called Porthos . When he playfully rolled on to his side , Erickson commented that Porthos seemed to have a lot of personality . Archer added that the dog had as big an appetite . Just before Erickson left the ship , she asked Archer to say goodbye to Porthos for her . ( ) At one point in November of 2154 , Porthos was in Archer ' s quarters with the captain and Ensign Hoshi Sato . He watched the Humans role - play that Sato was a Tellarite ambassador , the officers ' attempt to prepare for the real ambassador ' s visit aboard the ship . While playing the role , Sato told Archer that his " mangy pet , " referring to Porthos , would probably taste better than the food served aboard " Enterprise " . Once they had stopped role - playing , Sato told the captain that she actually did believe there was some truth to what she had said about Porthos . Archer initially thought she was implying that he was " mangy , " but Sato clarified that Tellarites considered canine a delicacy and suggested that the captain keep Porthos out of sight during their stay . ( ) Later that month , Dr . Phlox was captured by Rigelian s working for the Klingon Empire and forcefully taken to Qu ' Vat Colony . ( ) In Archer ' s quarters , the captain tried to comfort a miserable Porthos , who lay on Archer ' s bed . The captain realized that Porthos was either missing Phlox or depressed by the fact that the doctor had a stash of cheese in sickbay . Archer told Porthos to " hold that thought " before answering an incoming hail from Section 31 operative . Porthos watched as Harris told Archer that Phlox was on a mission of vital importance to Starfleet and advised the captain not to interfere . ( ) 2161 and 2370 . In 2161 , shortly before " Enterprise " was decommissioned , Porthos was in Archer ' s quarters while the captain and T ' Pol discussed a final meal for the crew that Chef was preparing . After T ' Pol left the room , Porthos jumped on to Archer ' s bed , whimpered and quickly licked around his own mouth . Archer rubbed behind the dog ' s ears and assured Porthos that Chef had promised to include six kinds of cheese . Porthos then affectionately licked Archer ' s nose . In 2370 , Commander William T . Riker watched a re - enactment of this scene in a holodeck aboard the . While later visiting the re - creation of the NX - class " Enterprise " with Counselor Deanna Troi , Riker recalled that Archer had owned a dog . Troi remembered that the dog ' s name had been Porthos and that one of the musketeers had been called the same name . ( ) Alternate timelines . In an alternate timeline , Archer was relieved of command of " Enterprise " in 2153 after parasites from a spatial anomaly made him unable to form long - term memories . Months after the incident , one of the few tasks he would still do would be to regularly take Porthos for walks . When T ' Pol once visited the former captain , Porthos sat on Archer ' s bed . ( ) Shortly after " Enterprise " traveled to 1944 of an alternate timeline , Porthos was in " Enterprise " s sickbay when Doctor Phlox tried to feed him a concoction of his favorite meal , chicken liver , mixed with grated cheddar . As Archer was believed to have died aboard the Xindi weapon , Porthos seemed extremely saddened and refused to taste the food presented to him . When Phlox offered to sing him a Denobulan lullaby , he crawled away from the doctor . Phlox then rubbed his back and suggested that he might enjoy a steak . Porthos reacted by licking his lips and gazing quickly at his surroundings , looking first at the Denobulan doctor . As Phlox left Porthos , he stated that he was going to find Chef . When Archer later entered sickbay , Porthos jumped up to his leg with a yelp , enormously excited to be reunited with the captain . Archer responded by rubbing Porthos ' head . He told Phlox that the doctor would never have to look after Porthos again . However , the Denobulan replied that , as always , he had enjoyed caring for the dog . ( ) Eating habits . Captain Archer regularly provided Porthos with dog food . This was stored in foil - wrapped packets that Archer poured into a bowl and gave to the dog . ( ) Porthos whimpered and complained to the captain if he missed any of his meals . ( ) The dog was fond of cheese , although it occasionally caused him to visit Dr . Phlox ( in sickbay ) for gastrointestinal distress . ( ) Appendices . Background information . In a commentary track for available on the ENT Season 1 DVD and Blu - ray , Brannon Braga recalls that he and Rick Berman had always wanted to have a dog as a character , so to speak , that appeared regularly . However , they had been extremely worried that there could be a backlash against their decision to finally include a dog in a " Star Trek " series . Rick Berman later recalled the casting sessions for the role of Porthos as the most fun of the necessary auditions before filming could begin . Several breeds of dog were tested before production personnel eventually chose to use a beagle . Prada was eventually cast as Porthos and played the role from " Broken Bow " up to and including . Some episodes of Season 1 required a more " spunky " beagle to play the role of Porthos . Although " Enterprise " s resident dog was male , a female beagle named Breezy was used for these episodes as she had a more playful nature than Prada did . After " Two Days and Two Nights " , Breezy and another female beagle named Windy took over the role . Due to strict welfare rules governing the use of animals on television and the expense of regularly having a dog on set , a couple of prop dogs were constructed early in the series to stand in for the real animals . These were still in use in Season 3 and one appeared in . The prosthetic Porthos figures seen in the episode – one suspended in the super - hydration tank and one resting inside the quarantine tank – were designed and constructed by Joel Harlow . Porthos featured in two scenes that were written for the Season 3 episode " Twilight " , but neither scene made it into the final show . Both scenes take place in an alternate timeline . One scene , which is set in the mess hall during the crew ' s regular movie night , shows Archer informing T ' Pol that Porthos has recently seemed frequently stressed and might benefit from Vulcan neuro - pressure . In the other scene , Porthos appears but is fifteen years older . Porthos was also featured in a deleted scene from . In the final draft script of , Porthos was featured in a short scene that does not appear in the final version of that episode . In it , Porthos was lying in Archer ' s quarters , late at night , but picked up his head when Archer offered him a treat . This scene was immediately before one that was not only in the script but is also in the final edit of the installment , in which Porthos is treated to some cheese Archer gives him in " Enterprise " s galley . Brannon Braga ultimately came to the decision that all of the viewers and production personnel had grown to like or accept Porthos . Perhaps as a result of his popularity , Porthos was the only character , besides the regulars , to appear in both the first and last episodes of . Porthos is the fourth of four recurring animals throughout " Star Trek " , the others being Livingston , the fish belonging to Jean - Luc Picard , Data ' s cat Spot in , and Chester , a cat owned by Miles O ' Brien in . Porthos is indirectly referenced in , when mentions " Admiral Archer ' s prized Beagle " . Screenwriter Roberto Orci , responding to a question about whether this was Porthos ( and whether veterinary science had advanced enough for a dog to live over a hundred years ) , answered " " YES ! " " It should be noted , however , that the individual who asked the question pleaded for the writer to " " please say yes . " " Along with Shran , Ambassador Soval , and , Porthos is one of only four characters , outside of the main ones , to appear in all four seasons of " Star Trek : Enterprise " . Of those four , Porthos is the only one to appear in more than one episode of each season . Porthos was " interviewed " by StarTrek . com as an April Fool ' s Day prank in 2011 . The It ' s A Wrap ! sale and auction auctioned off a bulletin board , similar to those created for other main characters , that was apparently dedicated to Porthos . . If it appeared on screen , it is unclear where . It included a number of jokes . Apocrypha . In the novelization of " " , it is said that Porthos was originally given to Archer from Becky ' s mother , having been bred as part of one of her prize litters , and that she was also responsible for naming the dog ( as well as his brothers ) . The story " The Fragile Beauty of Loyalty " sees Porthos volunteer to travel back in time to Archer ' s childhood and rescue him after young Archer falls through the ice , following a Temporal Cold War attempt to kill him before he reaches adulthood . In the novel " Patterns of Interference " Porthos died due to old age in March of 2166 , with Archer at his side .