Which pets-related expansion pack do you like most?

Sims 2 pets had werewolves, need I say more. I also liked the fact that the devs added cheats to control pets, basically giving players the opportunity to choose if they wanted to control pets, no mods required. The futuristic bedroom sets (called atomic age?) was also one of my favourites for kids bedrooms.

Sims 1 unleashed was also amazing because it added more lots to the neighbourhood. I haven't played a lot with sims 3 pets and never tried the horses but it sounds like a decent pack. The sims 4 one is OK, but lacks compared to the others.