i understand u want to create ur own presa, but why do that when u can buy from an accomplished breeder who is recognized as the 'father of the modern presa' and improvise from there. doesn't make sense, does it? alot of people are like u, they wanna come in and invent new things when it has already been invented. they are proud and refuse any form of advice. they breed, they sell to inexperienced owners. the dogs turn out to be crap and people attribute it to the breed. u have never owned a curto's before, u do not know what is it. u have been poisoned by the dogo canario mind. u work ur dogs, yes. everyone can work their dogs. on www.elpresa.com/forums, there are even people working their presas on wild boars, these dogs are in anyway much more superior and they have pedigrees traced back to curto's. cheers