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Canine Graduation

A Labrador retriever named Thunder under the direction of handler Donna Magness demonstrates his agility skills Tuesday, Sept. 24, 2013, at the University of Pennsylvania's Working Dog Center in Philadelphia. The Center began training puppies in Philadelphia on Sept. 11, 2012. (AP Photo/Matt Rourke)

02 / 02

Canine Graduation

A Labrador retriever named Thunder under the direction of handler Donna Magness demonstrates his agility skills Tuesday, Sept. 24, 2013, at the University of Pennsylvania's Working Dog Center in Philadelphia. The Center began training puppies in Philadelphia on Sept. 11, 2012. (AP Photo/Matt Rourke)