YOU’D HARDLY call a neighborhood stroll with Fido an act of high-risk bravado. But between 2001 and 2020, some 422,659 adults—that’s more than 20,000 per year—sought treatment in U.S. emergency rooms for injuries sustained while walking leashed dogs, according to a recent study by Johns Hopkins University. And then there are the uncounted number of dog-walk mishaps that get treated by primary care doctors or at home. It’s not a trivial matter: Older people are three times more likely to experience a fall-related injury while walking a leashed dog than are those under age 40, and 60 percent more likely to sustain a traumatic brain injury, the Johns Hopkins study showed.