GWP are a common cross with other dogs here. They'd be worth a try. One word of caution though - they can be "biters" and watch them if you have kids. I have had 3 GWP and won't have another one. All were a little scatty and not worth the risk around our children. All took dirt naps.
ive never had an issue with him around people but if two other dogs start going at it he wants to be right in the middle of it . i dont tolerate biting dogs , they dont last very long around my house !