dogs

Chubbs, right, a golden retriever and his pal Louie, left, a French bulldog, greet their friend at a small dog park in Chevy Chase, Md. Bill O'Leary/The Washington Post/Getty Images hide caption

THC, a key psychoactive ingredient in marijuana, is toxic to dogs, veterinarians warn. So keeping dogs away from discarded joints, edible marijuana or drug-tainted poop is important. Hillary Kladke/Getty Images hide caption

Hal Herzog, a professor of psychology at Western Carolina University, says the more we attribute humanlike qualities to animals, the more ethically problematic it may be to keep them as pets. Angela Hsieh/NPR hide caption

A border collie jumps to catch a flying disc during a competition. New research suggests that dog stress mirrors owner stress, especially in dogs and humans who compete together. Bela Szandelszky/AP hide caption

Daisy, the only dog Scott Simon's kids will get, runs on the beach in France. Elise Simon hide caption

For most of us, the benefits of a walk greatly outweigh the risks, doctors say. Get off the couch now. Elena Bandurka/EyeEm/Getty Images hide caption

High-speed tracking dogs have been a game-changer in the fight against rhino poaching in South Africa. Their success depends on their ability to work as a team, which means they sleep and eat in the pack-sized enclosures shown above. David Fuchs hide caption

An agent from the Bureau of Alcohol, Tobacco and Firearms trains a sniffer dog at its facility in Front Royal, Va. Brian Naylor/NPR hide caption