The Daily Puppy states that the American bulldog is the largest pit bull breed. Thee term "pit bull" is not an individual breed of dog.
The term pit bull is not acknowledged as a breed by the American Kennel Club, but it does refer to types of dog that are considered to be part pit bull. Caution is warned to those looking for a purebred pit bull breed. The Daily Puppy states that reputable breeders will breed puppies who are within the breed’s standard. If a breeder advertises large or extra-large "pit bulls," instead of stating the actual breed and has no association with a purebred dog registry, like the American Kennel Club, they not a reputable breeder.