We have had a dog for 3 years, 120 pound dobi/roti/tosu inu mix. Last winter we got a puppy terrier/pitbull mix. They got along great until last week. They used to play fight, but last week they started really growling, and fighting. I have been jumping and and breaking them up. After time apart they are fine for a while then they go at it again. I can't find any one thing that gets them going, sometimes it is near one food dish or the other, sometimes they are heading outside. Other times one is walking by while the other sits on the couch. Any ideas on what I can do to stop this, or should I let them fight until one whines or wimpers, then break it up to let one show dominance. I am jsut afraid that both breads may not back down no matter how much it hurts.