I have two Chessies, super-sized, way over the standard, brothers. No doubt, they would, and have demonstrated extreme defensive instincts, toward protecting the homestead, possessions, and my wife and kids. Unfortunately the neighbors and postman are enemies of the state! As well as any cat, stray dog, raccoon, possum, all of which are executed upon site, and delivered to the back step. I hunt them only when I am sure there will be no contact with any other hunter, or civillian, or even my Britts! It is hereditary, I raised these guys as part of the family, in the house, socialized with my daughters, from the time they were born. These are the third generation, and probably my last. I have found them to be fearless, able to enjoy conditions which would kill an ordinary dog, better protection than concealed carry, and smarter and more cunning than a Jurrasic Park raptor. With my family, I trustthem implicity. Also learn naturally, but not quickly, need to figure it out on their own, become stubborn and dangerous if pushed, ( sure wouldn't use a shock collar), More of a mutual tolerance relationship, based upon respect. If you can accept the terms of the partnership, its what you can expect. Dogs which are bred down to be tractable, within this breed, sometimes have fatal flaws, gunshy, fear biting, better to take 'em as nature made 'em or choose the tried and true Lab. IMHO, and experience, if you hunt for a living, in open water oceanlike conditions, or in the back country remote, or even pheasant hunt icy snowfilled cattails, mature crp, this is your dog, easily handles this and more, and you'll never loose a bird, or a fight!