This is a purebred bulldog. They have one of the same mutations that is sometimes found in people. They are one of the varieties of dwarves.
These dogs are believed to all descend from the same orignal dwarf pit bull or dwarf bulldog.
And they have been inbred (bred pure) for over 100 years.
Their problem isn’t biting people, so much as their wallets. And the dogs often suffer trying to just breathe.