I've had Bax, my lab/poodle mix, for about eight weeks now (btw, he's doing great! knows how to sit, lay down, roll over, shake with both paws, and one last trick: you can put a treat or a toy right on his paw or a couple yards away, and say "stay'. he will hold himself back until you say "go get it". pretty darn good for a 4.5 month old puppy!) Anyway, recently he has been getting very aggressive toward both my children and I. He has been snapping and I've taught my children how to take control- hold his collar and make him sit. However, he came up with this very clever way of snapping his head around to bite their wrists. He does the same to me. Today he broke my daughter's skin. I don't want my kids to be afraid of our dog, but at the same time I'm worried about this "extreme playfulness". I don't think that Baxter was playing when he bit my daughter. For some reason, he felt aggressive. I've had many dogs in the past but have never encountered this problem. Any advice?