A former roommate of mine used to have one. Great dog and he and my female GSP got along great, but he would let her kick his ass when she felt he was out of line. The only thing that I saw negative out of that dog was that if there was a deer within a half a mile of him, he would run it down and kill it. It only happened twice that I was aware of before we caught on and kept him out of any place that had deer. But wow, when that switch flipped, he became someone else.