We have 2 boxers, Riley (male 2 years) and a Layla (female 5 months), they have gotten along great from the beginning. On a few occassions Riley has given a little growl when he has had enough and Layla has always backed off which I thought was fine. Last night Layla was trying to get the biscuit out of Riley's mouth and he gave a little growl, Layla would normally back off, but last night she barked and snapped back- then it was over. About 3 hours later they where playing and I thought they were making their usual play noises but I looked over and Layla was on top of Riley and really growling. I think they might have just been playing rough because as soon as I got up they ran to the door to go out, but I was thinking what would I do if they began to fight. Has anyone ever had their dogs fight with each other? What did you do? How did you handle it?