I am glad he's working for you but until you see if he can stand up after 100 or 300 hogs you can't judge how well it works. And until you know if he isn't one of a kind it's hard to know how they will do. The ab and pit have been bred to be able to take some punishment, I hope for your sake the shepherds will too. Good luck with it and keep feeding him hogs.
I agree we need to see if their frame holds up over the long haul bc their bone structure is thinner than any bulldog. As athletic as they are I bet they do but defiantly on my watch list. IMO I dont think in any way mine is the exception to the rule regarding catching. This is my 4th one personally and all 4 of mine would catch and did, I just never let them outside of controlled situations bc they were my family pet. My other friend who has had 5 or 6 now had all but 1 of his catch, but same thing he only let them in controlled situations for fun bc he has good abs and his sh's are his inside pets. They are specifically bred for bite work ...
