they throw very true to type.these dogs are the result of over 30 yrs of line breeding, i dont recreate the breeding i just breed the line . i have never gone back to bull terrier. they dont need it, some times they can be to hard. one thing i have to watch is they seem to be getting bigger over the years. i try not to breed to big but some of the males have got up to 55-59 kg in working condition. i dont like them that big and try to breed from dogs that keep the size down a bit.