There are plenty of patterdales that can hold their own, with pedigrees going back years, and years, and years with no known bull blood in them!! In my opinion adding bull blood to a patterdale is Laziness!! put in the time and effort to find a line that sticks true to the breed. Anyone and I mean anyone with half an idea could breed a terrier that can be dug to by adding bull blood (because the prey drive is so high (which it should be!!)) But digging to a terrier week in week out, several times a week with no bull blood (or very little which is nigh on irrelevant) that only takes stick when