I have four dogs, and nothing else!
I wouldn't mind getting a small saltwater fish tank, though.
I love all animals, hampsters, gerbils, mice, rats, bunnies, birds, but I don't know that I'll ever own any of these unless I have lots of indoor space to dedicate to them (and only if my dogs are small-animal safe - which three of mine aren't). I always plan on having dogs, and maybe a kitty someday too!