Dog has shredded bark of keepsake tree. Help!?

You need someone to do a "bridge graft", it's like a heart transplant for trees. Not many people attempt it even tree surgeons. I've tried it three times on trees damaged by dog chains and only one survived it's first Dakota winter, an apple. It had a 6" trunk that was girdled 50% and I used three 1" grafts and pruned out 50% of it's branches. I had never seen it done before but I have done other grafting and had nothing to lose. It will never be normal looking, the trunk will always look very odd but it still produces apples. RScott