With Monday marking National Pet Day, check out which 10 dog breeds are the most popular in the U.S., based off American Kennel Club registration numbers for 2015.
Joe Raedle/Getty Images
Jamie McCarthy/Getty Images
Neilson Barnard/Getty Images for The Huffington Post
Al Bello/Getty Images
David McNew/Getty Images
Sign up for Breaking News, Daily Headlines, Severe Weather Alerts & more!