Pit Bull Terrier is a label more than a single breed. At shelters it usually covers the American Pit Bull Terrier, American Staffordshire Terrier, Staffordshire Bull Terrier, American Bullies and mixes with broad heads and muscular builds. All trace back to nineteenth-century British bull-and-terrier dogs, and shelter breed labels often don't match DNA.
That variety is worth keeping in mind in McAllen. Most of these dogs are medium-sized, short-coated and athletic, typically 30 to 65 pounds, and many are affectionate and eager to please. They're also strong, and some are selective about other dogs, so training and careful introductions matter. Because the type is so common, adopters can often look for adult dogs whose personalities are already showing.