As @Lillith mentions, it is a designer dog which is nothing but an overpriced mutt. The "micro" and "pocket" and "xl" and "xxl" versions are nothing but the marketing of a lack of standard for the breed. All American bullies are shown as "standard" as puppies, then are split out into the various "breed varieties" when they reach their full height. What does that mean? That means the breeders cannot breed a dog for a consistent size. And that size difference can occur within the same litter. And that means when they sella "pocket bully puppy", they are simply making a guess as to its adult size and they are likely to be wrong. So, they charge outrageous prices because they may have a disgruntled buyer a year later. The outrageous price covers the "financial loss" that will occur when the pocket bully puppy grows up to be an XL bully dog.