Ratdog
Ratdogs are a spliced animal species which escaped from the Junction City labs and eventually become a popular household pet. They’re not a perfect 1:1 of the critters that they’re named after; they have other animal DNA mixed in as well.
Ratdogs are marsupials. Both male and female ratdogs have pouches for carrying a single pup at a time. They also have ‘scent pits’ on their snouts, much like those of a snake, and their pawpads are sticky, like a geckos. They can’t climb up walls, but the sticky peets help them with caring for their young. Lastly, the ratdogs have blue blood and innards. This seems to be the exact same kind of blood found inside of horseshoe crabs - which has long been used to aide in the creation of various healthcare products. This, combined with the obvious opossum DNA, means that they are very healthy, hardy animals, which are disease free, even though they came from the sewers.
