I would strongly advise with any aggression problems that you are referred by your vet, to a dog behaviourist.
Zak was predisposed to people aggression, and had been trained from an early age. In fact he actually flew through his puppy, intermediate, and advanced training with flying colours, but despite all this, I could never truly trust him with strangers.
I was pack leader in every way with Zak, and he learned his place within our family extremely quickly. I will never know why he distrusted strangers, and whilst I do agree that the majority of problems dogs are a result of their owners, I strongly believe that with Zak, this was not the case.
A very prominent dog trainer, once offered us a lot of money for Zak to become a service dog, saying that he was wasted as a family pet, but I could not, and would not part with him.
Don't despair, but please speak with your vet
