I want a farming pack with horses and other farm animals. I think I'm pretty content otherwise. Rabbits might have been good small pets, but MFPS did the small animal theme. I have that though I've barely used it yet. I might consider it when I'm playing with more kids again.
I do play with the cats and dogs, even when they are a little annoying. I generally like them, I just ignore them if they act too needy and it isn't urgent. It'd be good if they would sometimes relax more, but generally I'm happy. I know some people aren't as keen, but some houses only feel complete with pets.