I really like animals, but i could NEVER tolerate them in the house.
I absolutely hate it when i visit friends who have cats or dogs and their fucking hair is EVERYWHERE, it smells of animal, shit, piss and dog/cat food in the house. You probably don't realize this whne you are living with an animal, like a smoker, but it's gross.
The worst thing is animals in the bedroom, it's more than disgusting to sleep in a bed where a dog or cat has been lying, no matter how "clean" they might be, they are still dirty.