In this Feb. 1, 2013 photo, pet owner, Linda Markley, walks with 

In this Feb. 1, 2013 photo, pet owner, Linda Markley, walks with her Labrador retriever, Riley,  at the Sepulveda Basin Off-Leash Dog Park in Encino, Calif. Markley loves Riley for dozens of reasons, but specifically cited the dog's intelligence. Besides single words like “keys,” “shoes,” “park,” and “shake,” Riley understands phrases like "go to Ryan's room,” "go to Jack's house," and "let's go for a hike,” she said. (AP Photo/Richard Vogel)
Associated Press
In this Feb. 1, 2013 photo, pet owner, Linda Markley, walks with her Labrador retriever, Riley, at the Sepulveda Basin Off-Leash Dog Park in Encino, Calif. Markley loves Riley for dozens of reasons, but specifically cited the dog's intelligence. Besides single words like “keys,” “shoes,” “park,” and “shake,” Riley understands phrases like "go to Ryan's room,” "go to Jack's house," and "let's go for a hike,” she said. (AP Photo/Richard Vogel)
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