Boys show off their four-legged friends at a rabies vaccination drive set up by the Serengeti Health Initiative in the Bariadi District of Tanzania. Anna Czupryna/Courtesy of Serengeti Health Initiative hide caption

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Zeus drinks from the kitchen faucet in Otsego, Mich. The Great Dane, the world's tallest dog, died last week. He was 5. Kevin Scott Ramos/Guinness World Records 2013 Book/AP hide caption

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The GoPro Fetch can fit dogs as small as 15 pounds and as large as 120 pounds. GoPro hide caption

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New GoPro Camera Harness Captures Dog's-Eye View

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Dogs throughout Latin America carry the Chagas parasite — and boost the risk of people catching it. And it's not just shelter dogs, like these in Mexico, who are at risk. Even family dogs get the deadly disease. Jose Luis Gonzalez /Reuters/Landov hide caption

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In June, the 167th Patrol Dog Class graduated from their canine narcotics and electronic media detection training, held by the Connecticut State Police Canine Unit. At far left is Thoreau, who now helps police in Rhode Island find computer hard drives. Daniel Owen/Courtesy of The Hartford Courant hide caption

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A fish that knows the way to go: the Chinook salmon, which appears to use the Earth's magnetic field to navigate ocean waters and rivers. Jeff T. Green/Getty Images hide caption

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The sexually transmitted cancer is common in street dogs around the world. Noel Celis/AFP/Getty Images hide caption

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