Didn't Black Metal Fighter weight close to 50 lbs, so a 45-50 lbs game bulldog would beat one of this huge dogs? I have read that Gr Ch BMF Tito's match with the Tosa went 1 hour and 12 min and that the Tosa died afterwards, never been able to see the vid.

I have seen vids matches of this other breeds and they don't last more than 20 min (with the exception of the Tosa).

Another thing is that many of this dogs are pushed by their owners.