dogs

Shelter dog Rohan takes a break from his scent detection trials to play outside. Rohan is one of several dogs training to detect homemade bombs at the Canine Science Collaboratory at Arizona State University. Jimmy Jenkins/KJZZ hide caption

Cheryl Woolnough, director of training at Patriot PAWS in Rockwall, Texas, works with Papi, a Labrador retriever. Lauren Silverman/KERA News hide caption

Tang Xiong Xiong, a Bichon Frise, came into the salon as a ball of fluff and emerged with her head shaped like a square. "She's getting used to it," says her owner. Elise Hu/NPR hide caption

A surgical team at Sooam Biotech in Seoul, South Korea, injects cloned embryos into the uterus of an anesthetized dog. Rob Stein/NPR hide caption

Ken (left) and Henry were created using DNA plucked from a skin cell of Melvin, the beloved pet of Paula and Phillip Dupont of Lafayette, La. Edmund D. Fountain for NPR hide caption

Lily chases sheep for the first time in her shepherd-mix life, at Raspberry Ridge Sheep Farm in eastern Pennsylvania. Several times a year the farm invites dogs for "herding instinct tests." Fred Mogul/WNYC hide caption

Hard to resist. But if they're marijuana edibles, not such a treat. James A. Guilliam/Getty Images hide caption

Dinaz Campbell, 10, holds Sherry, her newly adopted dog, at an adoption clinic in Rockville, Md. Marisa Penaloza/NPR hide caption

Researchers discovered ancient animal mummies piled up in heaps inside a catacomb. Many of the mummies were in poor condition. Courtesy of Paul Nicholson hide caption

Allen Burnsworth, owner of Sit Means Sit Dog Training in Los Angeles, demonstrates how to fight off a dog attack with Flash, a trained 2-year-old Belgian Malinois. Allie Ferguson/NPR hide caption