I have a rat terrier that lives in the house and he is about as calm as you could ask for and has never met a stranger. He likes everyone. He was easy to house train and sets on command and he's only 8 months old. I had one a couple years ago that was hyper, chewed on everything, and you couldn't teach him anything. I had to give him away to keep from killing him. The one I have is ared and white onebut they come in alot of different colors. If your going to get one make sure you ask alot of questions about there parents and try to stay away from the hyper and the super nervous ones. Good breeders won't breed these type dogs but the puppy mills will breed anything to make a buck. If you can go check out the parents before you buy a pup from them.