My ISFJ and me are both obsessed with our cat and dog. My ISFP and INFJ parents act really silly around/with their cats, too.

I like all animals and think they deserve advocacy, but I know lots of F types who say things like, "I'm a dog/cat person, not a (the opposite) kind of person!"
Then (if, for instance, they're just a cat person) they act towards my puppy like it's an alien, when, in fact, she's adorable (haha)!

Since all animals have different personalities, I don't get just liking cats, or just liking dogs, or any other animal, for that matter. They're all sweet and sentient.