Cosmo is often bullied at the dog park. He is always submissive to other dogs and just wants to play but more often than not he is warned off and/or attacked (no broken skin yet), even though he's instantly on his back. A friend suggested to me that he may not have learned the social ropes as a puppy. For instance, he does have an intense stare, but I assume most herding dogs do. Any ideas or suggestions for better doggie relations? We really feel for him. He's getting more shy about interacting given his many past encounters and rejections.