Xander, a pug mix, lost both his eyes in an accident. He now works as a therapy dog, and visits groups such as this class at a daycare center. Steven Silton/Herald and News hide caption

itoggle caption Steven Silton/Herald and News

A customer rolls a joint made of half marijuana and half tobacco in Olympia, Wash., on December 9, 2012. Nick Adams/Reuters/Landov hide caption

itoggle caption Nick Adams/Reuters/Landov

Malachy the Pekingese was named Best in Show at the 136th annual Westminster Kennel Club dog show in New York on Tuesday. Seth Wenig/AP hide caption

itoggle caption Seth Wenig/AP

Officials in Jiangmen, China, have cancelled a ban on dogs in urban areas. Here, a man plays with dogs in Shanghai. The city, China's largest, slashed its steep fees for dog registration and set a one-dog per family limit, trying to control a soaring pet population and curb rabies. AP hide caption

itoggle caption AP

Panda, a Border Collie sniffer dog, checks out samples at the Dogs Against Cancer and For Life Foundation in Hungary. Barnabas Honeczy/AP hide caption

itoggle caption Barnabas Honeczy/AP