There is the informal expression it's not (really) my/your thing ( with the variants not my bag, not my cup of tea). You hear that in adverts sometimes. Free dictionary defines it as:
Not something one particularly enjoys or is good at; it is not something that you really enjoy or are interested in:
- If skiing's not your thing, Soldier Hollow also offers snowshoeing and a lift-served tubing hill, plus rental equipment. (Soldier Hollow)
You could also turn the sentence round and say:
because you are not a (big) fan of animals...
a fan of (someone or something)
Someone who strongly likes, appreciates, supports, or is interested in someone or something.
- Sorry, but I'm not really a fan of Art Deco. (FreeDict)