some dogs dont grow out of it though my mate has a saluki grey and its a c**t for growling at other dogs over dead things and sometimes it tries to bite them i would try to stop the dog doin it mate because u dont want to be taking a dog out lamping in a motor and having a good nights haul and puttin the rabbits in the back of ya motor with the dogs then gettin half way home to here 1 of the dogs screaming in the back because the over dog is biteing it because it got to close to the rabbits ive seen it happen mate and it could end up with a vets bill