Yes, and it needs to be worked on... But I don't find it extreme enough to forgo the dog park completely. (3-4 times in 6 months.) We go every day. But we are going to go less (2-3 times a week) and I am going to work with him.
Would neutering him help with this behavior at all?
"I never saw a wild thing sorry for itself." -D.H. Lawrence
"Only when the last tree is cut, only when the last river is polluted, only when the last fish is caught, will they realize that you can’t eat money." –Native American proverb