Osiris, a 5-year-old Dutch Shepherd and trained therapy dog, has formed an unlikely friendship with Riff Ratt, a 7-month-old rescued rat. The two are inseparable and share a level of trust that is mind-blowing.

Despite initial worries about how they would get along, Osiris and Riff hit it off immediately and enjoy spending time together. They even show affection for one another, with Riff crawling into Osiris' mouth to clean his teeth. Their owner marvels at their unexpected bond and believes it gives hope for other creatures on the planet.