Like any working dog,bulldogs will vary when bred for winning or performance. Often the variations are looked over as there are weight classes for all of them. The big dog that wins is bred just like the little dog and often to one another. Size and shape follow that variation.

Even when within a family, even a tight bred family there will be an occasional big dog or little dog, away from the family norm. If that turned out to be a good one, then the variations start to mount.

Then, as will all working dogs, someone starts breeding for an outward appearance or a certain size or shape, or even color. The working ability starts to slide.

I would imagine at some point if a guy has a bone crushing killer and one of those little game ass terriers were available....etc.etc...
Maybe he says if the little terrier can give me ten more minutes I'm good.

Like the above post suggests, I was not there so I will have to work with what I have at my house. Just hard to say.

EWO