i tried to, but all the black dogs we bread where just way too hard and got hammered,we bread a line going back to almost 40 years and only last year i had to put a my 10 year old black dog down,there is one left but he is not worked,this is a old picture of my black dog,he looks like that because a fox removerd part of his upper roof of his mouth and i had to stitch a tiny piece of bone thro some tissure,he was too hard for his own good but he shamed many "so called GOOD dogs"r.i.p my boy