I have a 12 week old cockapoo puppy who is lovely and affectionate but very very bitey of my DDS and me. He really goes for me and gets wound up and won't stop. The vet assures me that some puppies bite more than others and he will grow out of it but I'm panicking I have bought an aggressive dog. He bites my DDS age nearly 5 and nearly 8 and then an hour later is snuggled up like a baby in my arms. He is from a reputable breeder and I am starting puppy classes soon but it is making me really distressed