My (soon to be) 5 month old Pem, Dexter, is becoming more and more aggressive. I believe it is because of his teething, but I can't be sure. I know his teeth are really bothering him, they are falling out and growing in, and he sometimes bleeds. I feel terrible about his pain, but the way he has been acting is unacceptable. He has a Nylabone, Kong, etc. I freeze rags and give them to him, and he loves pieces of ice. I feel like I'm doing the right thing for his teeth, so could it be…