Once again, if you are worried about dog fights, rough play will eventually start one. Many people say that their dogs rough play but from what I have seen, most dogs do not. The owners just aren't familiar with what rough play really looks like.
We have a 13-year golden who is extremely dog aggressive; in fact, it was rejected by her previous placement because it was attacking their small dogs. We got her and she has been a great dog for us, as long as we avoided other dogs.
Is the Golden dog aggressive or is the Golden small dog aggressive or did somebody improperly introduce the Golden to their pack?
When I get the ball and pull him to the side, he's happy to just hang out with me.
If you are worried about dog aggression, I would stop bring a ball to a dog park. You can count on treats and toys starting dog fights in a dog park.
The golden cringed away, went to the end of the leash, and started sniffing the ground. I had to use the leash to keep the pup away, and since he's 40 lbs now, that wasn't really so easy.
The Golden went heavily into avoidance and does not seem to be the problem at the moment.
Again, I was surprised because the puppy has met dozens of dogs and never fought any of them. Rough play, yes.
Time itself is a very powerful component of learning. So learn to wait. Learn to forgive. Learn to backup. It's all necessary for learning.
Teach! Teach! Teach! Be fair to your dog!