"Has he seen much work?"
Had one of my pups back to look after at 3 years old 28" and 90lb. He would see a dog run at it to scare it, then chase run it down and pin it to the floor. Or if the dog stood its ground, there would be a fight. The dog couldn't be trusted around stock and it was stock broken when it left here at 7 months old. His favourite trick was retrieving Swans! Totally unacceptable.
I had the dog for 4 weeks, out most days hunting, caught a few bits and the dog was changed. He realised dogs is not the game and I had removed his pent up energy.
This dog had