I know I'm more of a cat person because I've found I can learn to get along OK with virtually any cat, but I'm extremely picky about what kind of dog I'd want to live with. The smell thing is big factor. I can control litterbox odor easily enough (thank you, scoopables!) but bathing a greasy 90-pound Lab all the time is more than I want to deal with. I don't mind hair. (I own medium-sized spitz breeds--hair everywhere but no rancid skin oil.)

My brother loves cats but is dying for a dog, but once again, he doesn't want a big, sloppy, "doggie" dog. We don't do toy breeds, either. Too fragile. I had a friend in college whose 18-pound brown tabby slaughtered her roommate's 6-pound obnoxious Chihuahua.