i bean to your sight a few times and your dogs are exalent,your sertanly a great breeder that puts a lot of time and reserch also great deal of thought into your breeding program.i bean reading a lot of material into ppd,and if i was to treain a dog for that other then working gsd and malinos,my first choice of any bully breeds would be your dogs keep up the good work fraind in dogs NICK