I will readily admit that Bauer is kind of a sissy , but he is fine around most dogs. If a dog shows any aggression he immediately submits, but plays well with dogs that show no aggression. We were at the dog park on Saturday, and everything was fine until Lilly showed up. We were alternately throwing tennis balls into the water and down the path and the dogs were racing to get them. Lilly showed up, and immediately keyed in on Bauer and 2 other dogs. When they would go in the water, she would guard the shore and not let the other dogs out of the water. It immediately made for a stressful environment. She would bark and lunge at the other dogs (even grabbed a 5 month old lab puppy around the neck and took her to the ground). The owner stood there saying, "No, Lilly," over and over. I asked if she was always this aggressive, and the owner said, "She isn't aggressive, she is just playing." Really? It didn't look like playing to me (or the other people at the park). Why do people take dogs like that to the dog park?