Therefore, the study determined that the majority of dogs labeled as "pitbulls" are in fact mixed breed dogs (and not "pitbull mixes") as they have less than a 50% DNA concentration from pitbull-type ancestry or have another non-pitbull type breed as the dominant breed (over 50%) in their DNA. These scientific findings about the DNA of pitbull-type dogs have significant implications for dog bite statistics, medical studies on dog bites, and for breed-specific dog bans (aka breed-specific legislation or BSL) as we discuss below. As a general rule, dogs must have more than a 50% DNA concentration of a specific breed to be labeled as a mix of their dominant breed - for example, "Boxer mix" - and if they don't, then they are by definition considered to be mixed breed dogs (without any breed identifiers). Moreover, the study also found that the majority (62%) of the dogs with pitbull-type ancestry had less than a 50% DNA concentration from any of the four unique breeds commonly included in the modern pitbull-type category such as the American Pit Bull Terrier, American Staffordshire Terrier, Staffordshire Bull Terrier, and the American Bully. The peer-reviewed study tested the DNA of 919 dogs and found that of the 244 dogs with DNA from pitbull-type ancestry, 98% of the pitbull-type dogs were mixed breed dogs while only 2% were purebred.
A recent comprehensive study on the DNA of shelter dogs determined that the majority of dogs labeled as "pitbulls" are mixed breed dogs.
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