Tonight we started another advanced class and it was larger than the last class we had been in. This was a different group and I didn't know any of the dogs or owners, I guess everyone from my old group didn't continue. This boxer/pit mix had some kind of gentle leader or something over his mouth and he was not behaving at all. We were in heel position and walking around the room and the instructor stopped and put a pinch collar on this dog and she kept having to work with this girl and her dog cause he was not behaving. We were doing our turns and all of a sudden this dog attacks Remi and wouldn't let go of his lips. She was pulling her dog and Remi was pulling away and blood was going all over the place. Finally the instructor got the dog off Remi and told me to go sit in the corner. I was so upset and Remi was upset and she just kept teaching the class. I finally got Remi to leave because the dog kept passing us and growling. Normally she puts a dog on his side when they do this and it happened so fast I don't know if she did or not. I left because I was so upset I couldn't stay another minute. Should a dog like that be in an advanced class when he obviously doesn't know how to behave? I really thought she would have called to check on us but she hasn't. Remi has four puncture wounds on his lip and I am not sure if I should go see the vet in the morning or not.I started with this lady when Remi was four months old and we have worked so hard to get to where we are but I don't think I can go back to this class with a dog like this in there. I have cried since I got home because it is so unfair to Remi. I hope he is not gonna have any trauma because of this. I am sorry I am rambling on but I have never had anything like this happen to my baby and I don't think the instructor handled this very well. And the girl didn't even tell us she was sorry. Am I just being hysterical?