We have two dogs. One is about 14 months old and a male Chiwiener and the other one is 10 months old and a female Australian cattle dog mix. Ever since we brought the younger dog home, they have been play-fighting non-stop. You cannot pet one without the other one wanting attention. They constantly steal each other's treats and toys. It is fairly obvious that the larger and younger dog is the more dominant one, but there is a constant power struggle between the two. Will it ever end? How can we encourage a more harmonic behavior between the two?