there aint many that can be dug to, never was.
That's nothing that couldn't be sorted in a generation, The wrong outcross was used with no thought of earthwork, WM
even before the outcross, dogs that could be dug to were thin on the ground, some that had been worked below ground were 2nd rate, prob only bolting types, but hyped up by there owners, in 15 years i must have turned over every stone in plummer world, didnt find much then when u do find agud dog u need agud bitch to put to it best of luck to them that still look, may u live long