We took Corky to the park the other day for a nice 3 mile walk. (since we were told he needed to be stimulated more) He used to be decent on walks when we would walk in a group. But the other day he was constantly barking at EVERYTHING. Other people, dogs, children, or just at nothing. He pulled and ran at full speed from the left to the right. And if there was a dog a few feet ahead of us he would whine a lot. (which someone said was a herding trait) And after the walk he was still just as hyper as when we started. We were pretty exhausted after that whole event.