I have a young male Catahoula (we think), who is neutered. We take him to the dog park regularly, and recently, he has started having problems. He is great with the other dogs 99% of the time. However, whenever someone brings in an extremely high-energy dog, (the type that comes flying in, bouncing all over the walls, jumping all over people, etc.) he tries to pin them down, and growls. He isn't aggressive about it, he doesn't use his mouth or try to bite them, he just uses his body to push them down. Its definitely not an "attacking" thing, and the other dogs don't react badly. Other than this, he doesn't really display dominant behavior. He doesn't mount other dogs, and is pretty respectful most of the time. He has no problem rolling over on his back when he is playing with them. Im just not sure what causes him to act like this. I do get embarrassed, but thankfully no one has gotten angry about it. After the dog has calmed down a bit, he is their best friend. No problems at all. How should I address this? Should I keep him near me until the other dog calms down? Thanks in advance for any help.