With cats and birds, you don't have to stand there and wait while they do it. And it's not nearly as voluminous. But you're right; I don't understand the appeal of keeping cats and birds either (and I find keeping birds that are capable of flight caged to be a bit cruel). At least birds sing and fish are nice to look at. I will admit that dogs are friendly and loyal, whereas cats give off an arrogant vibe. ** Don't get me wrong, I don't hate dogs or anything. I think they can be very helpful animals. I just don't get this whole deal of keeping them in the house and pampering them.