Oh those teeth, it scares me when Tucker and one of his friends play like that since we had a issue with the two of them in the summer.. The other dog bit Tucker in his mouth and caused a very big hole in Tuck's mouth that ended in a vet visit...Now it seems like the other dog just has to get the little harder bite in there when they are playing rough we are thinking about buying the two of them muzzles so that when they play there is no chance of teeth getting involved, we don't want to stop them seeing each other as they do like each other and are happy when together but they get carried away..They are both dominant males but are both fixed they just get a little too rough