My current bitch. 5 years old, done 2 good seasons. She is Russel/Patterdale, shes a cracking bolter. And is now a trusted digging bitch. Couldnt ask for more!
Got 4, 12 day old pups out of her, to run on a bitch for the future! By my fell dog, who will be approaching the end of his career after the next season or two, as he is 7 years now, and has done a lot of good work for us.
Edited just to say that although my bitch isnt hard, she still has to find well, bolt well or stay until dug to(up to the quarry). I expect all my terriers to do this regardless of them being dog or bitch.