Fun fighting is very much a natural part of a dog's life, especially when dogs are young. It's their way of sizing each other up, establishing pack order, and maintaining that order - and, of course, it's enjoyable for them. Dogs possess an innate drive to establish pack hierarchy. They wrestle, tug, mouth, pounce, play bite, and even softly growl and yelp. And, this is all okay - as long as the dogs maintain self-control and do not allow their behavior to escalate into outright aggression. When it comes to play fighting, the key is deliberate intent. If two dogs are wrestling and one dog accidentally goes a little overboard, you should see that dog immediately back off when the other dog gives a little yelp, for example. The ultimate goal with dog ownership should be to maximize our dog's quality and enjoyment of life, so we certainly don't want to be so strict and unaccommodating that we quench our dog's natural desire to wrestle and play tug of war with their bodies or other objects.