Jake just turned 1 and for the past couple of months he's been a bully at the dog park. He will pin down a dog and growl. He does'nt bite and he's never injured a dog but it sounds like an aggresive dog and it scares the other dog owners(can't say I blame them I would feel the same way)He does'nt do it every time I go there in fact it's only happened a few times. He is neutered and it never has to do with toys,a particular breed,a certain sex, or a certain situation. It must be some kind of dog communication that I don't see. When it does happen I always give him a timeout and if it happens a second time we leave. I would hate to stop going there because he loves it there but it's very embarrasing and it not fare to the others that go there. If anyone has any ideas or if I am doing the right thing will he eventually stop?