a sportsdog is easier to train...a "natural born policedog" is per definition stubborn, hard headed, dominant and very brave. To train such a dog you have to work very hard (and put up litterarly a fight sometimes) and isn´t fix in a short time.
The people willing and able to train this kind of dogs are a few. If i take myself as a example.. I can´t work a dog like that ´cause i will loose on the physical part. Favorite saying of my dad: "women doesn´t belong in KNPV, they can´t work a policedog" and hard it is to admit..it is true. (end quote)
My last dog that I trained for Search work came from very strong KNVP lines, she was a Baden lines dog. One of his students purchased his dog and got permission to breed back to one of his. I guess she would fit that description of stubborn, brave and hard headed, but in the longrun, she was very good with people. Very dominant from the beggining though and remained very dominant, but never dominant when her treatment was fair and kind. She only challenged me once as a young pup over nail trimming. The hard headedness showed up when I gave up on all resources to cure her jumping around in the vehicle when not in the vehicle crate (actually she would tip the crate in the vehicle sometimes). I finally broke down and bought a shock collar. That dog couldn't have cared less about it. I tested it so many times, thinking it must not be working. At full strength, she would show the slightest tilt of her head as if a flea had bothered her. My friend, a fireman didn't believe the strength I told him the collar was giving and he was dumb enough to put his hand on it. He was so Shocked (all pun intended) when he got the gist of what this dog was ingoring. So I threw it away. You know, that was the only commnand I could never get that dog to follow. STOP JUMPING OVER MY VAN SEATS, back and forth like a rabbit every time we went near the bush to train.