it dont take them long to no that biting down hard is no good how do you stop a dog being hard mouthed if its better ill use that
not been funny mate but surely associating the rabbit fur with barbed wire will put the dog completely off running rabbits if it knows that every time it bites it will hurt its self, i see where ur coming from but personally fink its a bit harsh
put rabbit skin round a plastic bottle & when the dog bites down on it all the air comes out, the dog shits its self & never does it again.