you can train discipline etc it takes time and effort but it can be done yes in a lot of cases a bullet is the quick answer and with a lot of owners its the only way but it always comes back to the owner not the dogYes it is down to the owners but when a dog gets a taste for it and it won't stop a bullet is the only way,sadly you cannot shoot the owners.But if you could it would solve the problem or just get them to keep their dog under control would help