I know I've mentioned this before, but I've noticed something a bit different now when Bella and I are at the dog park. When she gets excited wrestling and playing with the other dogs, she also becomes more "bitey". After a heavy play, I'll reach down to pat her and she'll bite my hand. I know part of it is because of the excitement around her...but I wonder if it's because in play the dogs have been biting her that hard, so she thinks it's okay to do it. Bella's gotten pretty good now with the no bite command at home, and I use the same principles at the park, but for some reason the more hyper she gets, she more she feels she wants to bite, and it's harder than she does at home. She's never bitten hard enough to draw blood, but she did once jump up to bite my elbow with no provocation...and bruised my arm in the process. She's never done this with anyone else at the park, thank goodness...but why is she doing it to me at all? Is there a reason why she does this only at the park and only when she's been playing hard? What can I do to stop her at the park?