请编写一段有关特定主题的短故事，并在其中使用提供的关键词。

Write a short story using the following keywords: dog, detective, mystery, and adventure.
Detective Rex was a renowned investigator, but he had never encountered a mystery like this one. It all started when a wealthy dog owner came to his office, crying about her lost pup Odin. The woman claimed that Odin had been stolen from her mansion under mysterious circumstances. 

Rex took the case and immediately began to investigate. He went to the mansion and examined the scene of the crime. As he searched for clues, he felt like he was on an adventure, unraveling a mystery like never before. 

Days passed, and the trail went cold, until one day Rex received an anonymous tip that pointed him to a remote location. Without hesitating, Rex set out on the adventure, determined to solve the case. 

The journey was long and arduous, but when Rex arrived at the location, he found Odin safe and sound, being held by a group of mischievous cats. The detective had solved the mystery, and the dog owner was overjoyed to be reunited with her beloved pet. 

From that day on, Detective Rex and Odin became inseparable companions, always ready for a new adventure and ready to solve any mystery that came their way.