[yorkietalkjilly]

You become the aggressor to the dog when you rush in & grab them by the collar or neck scruff in a dog fight where instincts kick into survival mode. The back legs are the only safe way to stop a dog fight - but don't stop there. Tell the other owner or anyone to remove the other dog so they won't start up again or they most likely will, as soon as you let them go. Keep moving your dog in a circle or "walking" it on its forepaws as you hold the back legs up so it can't get to you until it calms down & comes to itself - and the other dog is gone. One of the dogs has to be removed - usually the smaller dog - as the owner of the larger dog continues the rear-leg holding/circling away from the scene of the fight. Go faster if he's trying to turn & nip you. Try to circle/walk it toward the gate & out of the enclosure to your car, get someone to open a door & guide him in, close the door. Now that it has happened once, it could very easily recur so you are going to either have to leash him at the dog park or start pretty disciplined training to keep him in line.