We added Sadie to our home on Friday, 04/10/09. She is 9 weeks old today and is so cute. I took her to her first vet check and the veternarian feels that she has a behavioral problem and is very concerned because I have a 4 year old son. Sadie did not act afraid of anyone or anything at the vet's office including the vet himself. She would jump up on him and ask for his attention, before and after his exam of her. However, while he was examining her, she growled furociously. That was the first trigger that concerned him. Then while visiting with me about injections, etc., he picked her up and was playing with her. After about 30 seconds, if that long, she began growling and snapped at him a couple of times. It was not at all playful behavior. There were times when he would hold her in a submissive position, i.e. on her back in his arms, and she would do fine. So we began to narrow it down to she mostly did it when he would rub her head, mostly around her ears. He checked real good around her ears and head to make sure there was no sore spots, lumps, or problems. I have never seen her act like this in the time we have had her. We have not played aggressive with her and I have tried to correct her from nipping, biting, or pulling at things with a firm NO and removal from the situation. The vet was concerned enough that he said he would not give her a shot today and let me think about our future with this puppy first. He was comparing her to all the puppies he sees everyday and says it has been a long time since he has seen one do what Sadie did and it is very rare. He is concerned for my son and/or any friends he might have over. Has anyone seen this kind of problem before or have any advice? Thanks.