Least common dog breed in the US?
The AKC ranks the English Foxhound as the least common breed of dog.
The Labrador Retriever is the most common purebred dog in America, and has been for the past 20 years (based on the American Kennel Club 2010 registration statistics). The German Shepard is the second most common breed, followed by the Yorkshire Terrier. Check out the related link for the AKC dog registration statistics.