The biggest problem with the Dogo is that most breeders are not hunters and are not proving entire litters and culling and keeping only the best of the best. When the Dogo was developed the culling that would have taken place would have been massive. Today's breeders seam to want to skip that part. The hunting breeders who prove their lines on hundreds of hogs are few, but if you get a Dogo from those lines your probably going to get a pretty solid dog.
I agree that the difference between the top end dogs is small, as it is with any other "type" of dog, just like there is not much difference between a good Catahoula and a good BMC.
If I was going to buy a Dogo there would only be two or three places that dog would come from.
We are in agreement...and your closing statement is exactly why I believe the good ones are few and far between.
But as far as one that performs as a lead in cd the cull rate is very close to that of any other bulldog, most will catch.
My experience (and the experience of friends who have owned/hunted the dogo for many years) has not borne that out.