cute dogs, cats, and other animals

It's pretty stressful for a cat.

Dogs probably don't mind (depends on the individual dog, really), but it is hard to find hotels that allow pets and usually more expensive when you do find one.

Plus if you're doing stuff like visiting Disney Land or something, why bother bringing them? They can't go in the park, and they most certainly couldn't partake in the rides. So it would just be cumbersome having them with you.