Our puppy is great, a happy confident little chap. He loves to play and fetch his ball etc. When he gets really overexcited he goes bananas and starts to bite your trouser leg and feet and growls madly. I am stopping it at the moment by picking him up with one hand under his tummy and holding him away from me, this seems to calm him. Obviously I am not going to be able to do this when he gets bigger (although he's only a terrier). Any advice?