Dog ( Fallout : New Vegas ) Dogs are found in the Mojave Wasteland in 2281 . Background . Dogs in " Fallout : New Vegas " appear in many different forms , serving as guard dogs for Caesar ' s Legion , the Fiends and the New California Republic , and as pets of wastelanders such as Old Lady Gibson and Sunny Smiles . Non - aggressive dogs may also be found throughout the wasteland , including one simply referred to as " dog , " which may be found wandering outside of the NCR Correctional Facility . Vicious dogs can often be found in packs , in several areas of the Mojave away from human settlements . Characteristics . Biology . Through the 200 years since the Great War , dogs have remained unaltered by radiation . Because of that , there is no reason to believe that the biology of dogs in the " Fallout " universe differs from dogs in the real world , other than having a rougher appearance than domesticated dogs which is unsurprising due to the harshness of the Wasteland . Gameplay attributes . Legion mongrels and NCR guard dogs will attack player characters that have low with their associated faction . Fiend guard dogs and vicious dogs will attack on sight , regardless of reputation , while wild dogs and will only attack if the player character is close enough to make them feel threatened . With the Animal Friend perk , dogs will not attack unless provoked . Variants . Dog . Regular dogs with standard statistics and characteristics but no special attributes . Large dogs don ' t differ much , aside from being stronger than the basic variety . Regular dogs roam Zion Canyon . Old Lady Gibson owns six of these animals to guard her junkyard . The prospector ' s dog is a very rare variant that is found in only three places : Smith Mesa Prospector Camp , Ivanpah Dry Lake and El Dorado Dry Lake . Legion mongrel . Legion mongrels are dogs owned and bred by the Houndmasters of Caesar ' s Legion . Mongrels are mainly used in combat and scouting missions by the Legion . The current mother of the mongrels in the Fort is Lupa . Because of their thick , shaggy hair ( as seen in the picture ) and their red - colored eyes , they are of a distinctly different breed than most dogs found in the game . Their appearance more resembles that of a wolf or coyote . While most of them are bred , Antony says the Legion sometimes finds good mongrels in Denver , the " Dog City . " NCR guard dog . The breed commonly used as guard dogs looks similar to the vicious dogs that roam the Mojave Wasteland . As is with the vicious dog , the NCR guard dogs are not as resilient as the Legion mongrels . This is probably due to their lack of selective breeding and decent training , unlike the Legion who regularly train their dogs in fights against captured enemies in the Fort and only select the strongest dogs to breed . NCR guard dogs are widely used by NCR trooper s and are similar to the Legion mongrel . They can be seen patrolling Camp Forlorn Hope and HELIOS One ( including the shack containing terminal B ) with NCR soldiers . In the quest You ' ll Know It When It Happens , if the Courier has the Animal Friend perk , Ranger Stevens will agree to lend his dog to them , allowing him to discover the undercover member of Caesar ' s Legion with the detonator for the bomb placed aboard Bear Force One . Vicious dog . Vicious dogs are a nearly hairless species of wasteland canine with a close similarity to pit bulls . Ruthless survivors of the wastes , these starving , irradiated mutts will attack anything that moves , including the player character , unless they have acquired the Animal Friend perk . Vicious dogs are also known to hunt in packs . The vicious dogs in " Fallout : New Vegas " resemble the ones featured in " Fallout 3 " , as well as the guard dogs used by the NCR , and Fiend guard dogs used by Violet . Wild dog . Wild dogs and large wild dogs can be found near the NCRCF . They are rarely hostile and will only attack the player character if they get too close , or if first provoked by attacking them or one of their pack . White Legs mongrel ( Honest Hearts ) . White Legs mongrels appear throughout the Zion Canyon , accompanying members of the White Legs tribe and will attack the player character on sight . They are identical to the Legion mongrel , which implies that Caesar may have given them to the tribe to aid in destroying New Canaan . White Legs mongrels will not attack on sight with the Animal Friend perk . Ranch dog . Ranch dogs are a variant of dogs in the Mojave Wasteland in 2281 . Sheep dog . Sheep dog was a type of dog cut from the final version of " " . Appearances . Dogs appear in " " and its , " Honest Hearts " .