I've not seen this in a dog before....we took on a rescue dog before Christmas, very good shelter and tbh he is a good dog. He is 2 years old, definitely a hound (although no idea what type) very lively, bouncy and active. Has had 6 homes and I am determined that we are going to be his last. He has within the last few days picked up an unnerving habit during play of jumping up and trying to bite mine or mine husbands face (thankfully not the children's) He mouths anyway (he is an overgrown puppy I think) but the attempted face biting is a bit strange.
Has anyone seen this or knows where it may stem from with a view to training it out of him (he was very sorry for himself when I told him off)