I think it comes down to each dog, you could have 2 brothers from the same. And both brought up the same way, and one can be hard mouth and the other soft mouth. Some times when dogs go from rabbits to hares [pre ban] ,some dogs will kill a hare to stop it kicking. And some do the same when they have caught alot of rabbits. If you catch just a few rabbits, [maybe] go a little softer.But once they go hard mouth, i dont think will go back .
got to agree with you bird,bit like flicking a coin
asme9