I got my pup Diego just over a week ago, he's 11 weeks old. Up until a couple of days ago he was really good around my younger brother who has severe disabilities. He then started licking his face a lot more but would generally stop after being told to. He's now progressed to biting his arm, enough to break the skin, licking his face and trying to bite his face. My brother doesn't understand and can't do anything to stop him. He now refuses to listen to myself or my parents when we tell him not to and I'm worried it's just going to get worse! I can't segregate them most of the time either cos I have to look after them both during the day! Any advice would be really appreciated! Thanks!