When working with high drive dogs, I usually get them use to me handling their food. For example, starting as a puppy, I often feed them from my hand. If I get a nip, almost always by mistake, I sternly say "don't bite' the words mean little if anything, it's the tone. If the pup acts aggressively, I generally follow up with a light tap on the gowls. Really, its the intimidation and my dominance that works. As the pups turn into full grown, the method continues. This methods tends to make the dog understand that it is my hand that feeds him, and he better not bite the hand that feeds him. I do this not only for my safety, but because all of my dogs are inside dogs, and I often have kids in my home.
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