Which pets-related expansion pack do you like most?

Sims 2 Pets, though Sims 3 Pets is really close.

I like the style of what the pets in 2 look like the most, add the Werewolves into the mix and you got me there :3 The pets look quite odd in 3, but the sheer amount of features it has makes up significantly for it, like the option to control pets and check their motives without cheats (2 at least allows so with cheats), and it's also the only game with horses.