how i look at it, if we are lucky enough to get our hands on some good blood , its our duty not to f**k it up and thats the working side, i've had the same family of dogs since the early 80's i've line bred and inbred and outcrossed in that time, i now have a young bitch 5 generations from my first brood bitch won't bore you with details , but as long as all you want is workers as good as what you started with don't worry about things such as correct bites, good coats, colour ,short backs and pointy tails just worry about do they work ,