Thanks a lot for all your advice. I know Archie isn't quite dog agressive, but it is becoming a problem when he growls at or nips at even one or two dogs that he doesn't like, not because I believe he would ever attack or draw blood from any other dog, but because I'm afraid he might someday attack a not-so-friendly dog and get hurt. The main reason I take him to the dog park is because I meet my friends and their dogs there, and Archie is buddies with most of their dogs. I guess they'll have to come over from now on. I'm definately going to cut down, or just stop taking him to the park. He gets a LOT of exercise and activity besides that (flyball, agility training, obedience, daily runs, playing with the neighbors dogs, etc) anyway. I think youre absolutely right about quitting the dog park visits. Thank you!