Boston terriers reclaim the top spot, and cocker spaniels begin their impressive climb. In the 1930s, the decade of the Great Depression, all top 10 breeds are small or medium-sized companion dogs.

Reuters
Penny the Boston Terrier votes with her owners, Amy O'Neill (L) and girlfriend Michelle Nowakowski, during the U.S. presidential election in Milwaukee, Wisconsin November 6, 2012.