Hi, I'm new to the website. We have a new golden puppy and he is our first dog. I read many many books before he arrived and have adopted an approach of positive reinforcement. He is a very confident puppy (the vet commented on this) and is sweet and playful. Often when he plays he growls but as it sounds like playful growling it hasn't bothered me. However if I stop him doing something he is really enjoying (e.g. my son dropped his sandwich on the floor and my puppy went to eat it) my puppy will growl/snarl at me in a very cross way and bite me (not like playful nibbling but a cross snap). I am obviously trying to teach him that this is wrong, but the thing that I really wanted to ask more experienced owners is: does this suggest that my puppy might grow up to have aggression problems i.e that unacceptable aggression levels are inherent in his nature? Or is he just pushing boundaries and trying to be boss? I am very worried as I have children and specifically chose a golden because they are known to be good with children. Incidentally I got him from a very reputable breeder and he is 9-10 weeks old. I cannot tell you how much I would appreciate some guidance. Many thanks Charlotte.