bollocks , the terrier i had for bolting wasnt a killing bitch but it mixed it & stuck with the fox untill bolted or we dug her , i also had a kennel full of dogs which if you couldnt dig the place you didnt put the dogs in !, everyone of them on meeting the fox killed it in a breath , so is it a bolter or a stayer ???
If she stayed till you dug her then I'd say she was a digging bitch, who said anything about a 'killing' dog. If they stay till dug then they're a digging dog, if they'll give up after a length of time then they're a bolting dog. Simple as that I think.
You say you had