Oh Rustysmum! Please don't despair, it really is normal and also should only be shortlived, it doesn't last forever, believe me. There isn't one of us on here that hasn't had a pup that bites and growls, the growling will be playful even though it can sound nasty :roll: Your pup is pushing the boundaries to see how far he can get, again also perfectly normal
Please don't change the food to Bakers, it does have artificial bits and bobs in, so is not really ideal for a young pup, try to chose a natural food, like Burns, Nutro etc!
Have you contacted the breeder? Maybe if the breeder lives close enough he/she would be willing to come to your house and see exactly how your pup is acting, I am sure he/she will tell you its normal, but at least then you have peace of mind in knowing this from someone who has seen your pup "in action" so to speak :wink:
How old is your pup again?
I am certain some of the more informed guys than me will be along soon, to offer their advise and comments