Everything, time, data
Everyone asks what makes a good mini bulldog stud. Most people think it's the head, the structure, the size, the color, the pedigree, how cute the puppies are, the movement. It's three words: everything, time, data. And none of them are negotiable.
Everything: the structure, the functionality, the movement, the temperament with other dogs, people and kids, the chest, the leg length, how the legs and joints line up so he moves well, a back length that keeps the hips from sitting too high. Does he move well, run well, go up stairs? It all has to be in one package.
Time and data: nothing replaces time. The years a stud has been producing give you the data. Is he producing healthy puppies at birth? Do they grow up with the temperament and structure he has? Sometimes a stud has all the attributes but doesn't pass them on, because he doesn't carry enough of the dominant traits.
From the data: do I have adult dogs from this stud that are healthy, living long, breathing well, good with kids? Is he producing true minis and micros, true functional dogs? You can't cheat the data without time.