Charlie is an alpha dog. One day we get a call from Charlie's breeder and she said we have a little girl for us if we're interested. I told her all about Charlie and she said this puppy will not get along with Charlie. A couple of months later we get a call from the breeder and she said she has this sweetest little female puppy that will work with Charlie. So we decided to get her. The two are inseparable and they do get a long, once in a while Charlie will put Katie in her place. Katie is so sweet, smart and bossy. Charlie is the alpha dog, but Katie runs the show, LOL.