Many mammals make excellent pets. Goat, sheep, pot bellied pig, pony, horse (of course), donkey, and mule are all fine examples. Then consider the small mammals, such as monkey, hamster, gerbil, rat, mouse, guinea pig, chinchilla, rabbit, ferret, cat, and dog. Recently I watched a TV program that featured a hippo named Jessica, who is making a very good pet for a South African family, and their dogs.
Jessica the pet hippo. (3:06)
Among all these choices, humans for the most part consider a cat or dog their best pet bet. And for good reasons, which will be explored here in future blog entries.