Which pets-related expansion pack do you like most?

I have played the pets versions from Sims 2 to Sims 4. I loved them all for different reasons, even though I don't own my first pet stuff.
I chose sims 2 for pets, because my pets could get jobs, and each promotion unlocked coat colors and patterns. I also went with it, because I was playing it one time, and had two cats go outside to a doghouse where they would get together. My Sims inside the house ran out of the house to cheer them on, so I am entirely biased due to that.

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.