dog sigh

If my dog were in school, he would totally not get the comment "plays well with others" on his report card. He's fine generally, but every few dog park visits, he decides that he must munch on a smaller dog and becomes fixated on him or her. I don't think he ever gets aggressive or breaks skin or anything, but he is so single-minded in playing with the dog that he knocks the dog over and chews on the dog. Often, the other dog yelps. And then Giles and I have to leave the dog park with our tails between our legs as the other owners shake their heads at us in shame.