Not only were shelter workers relatively inaccurate with their breed labels, according to the data, but even correctly-identified dogs generally got less than half of their genome from the so-called primary breed. Dogs correctly ID-ed as pit bull mixes were on average only 38-48 percent “pit bull,” here defined as having some heritage from an American Staffordshire Terrier, an American Bulldog, a Bull Terrier, or a Staffordshire Bull Terrier. The same was true for other breeds. Chihuahua mixes were generally about 38 to 39 percent Chihuahua. Poodle mixes were only around one-third Poodle.