We have a one and a half year old female Carolina rescue (spade when we got her, unfortunately) and it was a trainer who had owned one herself that clued us into Sam's breed. We checked off every marker that distinguishes the breed and only wish there was a DNA test available to confirm it. Most intelligent dog I've ever owned with some behaviors that are just "different". Very glad we have her at such a young age and may enjoy being her pack for a few years to come.
These Carolina dogs are beautiful. We plan on trying to find one to add to our pack of pugs and a Swedish Vallhund.
Actually, there are more--28 in the USA. Check out this web page of the American Association of Veterinary Medical Colleges (AAVMC). I teach at Auburn University in Alabama, which is famous for their AAVMC affiliation.
Today, the Association of American Veterinary Medical Colleges coordinates the affairs of all 28 U.S. veterinary medical colleges, all five Canadian colleges of veterinary medicine, nine U.S. departments of veterinary science, eight U.S. departments of comparative medicine, eight international veterinary schools, three veterinary medical education organizations, and four affiliate international veterinary schools. The association represents more than 4,000 faculty, 5,000 staff, 10,000 veterinary students, and 3,000 graduate students at these institutions.