dont think theres a problem if you want to breed of your dog which is a good dog definatley do it mate ,i would want somthing out of a dog i owned.
but if it is just a pup you want ,to carry on your line from your dog ,do you not know anyone who has a good proven bitch?
As you put up dog for stud that sounds like you would stud him to anything ,which as celtic hound said leaves you wide open to critisism on here by allsorts of people.
I think the people who own the punch bred dogs have as stated kept there line very tight and gaurded and can see there point when a much diluted strain of th