Again it depends a lot on the bull blood thats used in the mating.A lot of lads use bull just for the sake of it without doing their homework on the bull in question or even seeing it work.There is a lot of shit been bred with bullx's as there is with any breed of terrier,patt.border.jrt.lakey there all the same,again its down to doing the homework first before the breeding and not breeding just because you like the look of the dog or bitch.I have seen down through the years as good of bullx's as any other breed of terrier and as many failure's with full terriers as bullx's.
I agree fatma