Sims 4

@sophie_potentia Fair warning that I could be wrong about this, but my reading of the description for the pack is that only small animals are provided. Everything else looks cosmetic, like outfits for dog and cats.

"Add a habitat to your household with all-new small pets like a hamster, rat, pygmy hedgehog, or miniature bubalus! Have your Sims name their new pet and learn how to take care of them, whether its spending time playing or keeping them clean and healthy. Your Sims have lots to learn!"

https://www.ea.com/en/games/the-sims/the-sims-4/store/addons/the-sims-4-my-first-pet-stuff

Edit: I've also moved your thread to one of the boards on The Sims 4 forum. There should be someone here who will be happy to confirm or correct my understanding of what the pack provides.