Hi there! As well as many of you I also like to make the game as much realistic as I can. This is why I created new Sims 4 custom traits to give to the game more realism. (Just to clarify, I love animals but I thought creating some negative traits can be useful for storytelling purposes). All 9 custom traits are related to Cats&Dogs so you need to have this expansion to have it working. Allergic to Fur / Cats / Dogs - you can love animals and still have the allergy, this is