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New York City’s Leptospirosis Problem and How to Protect Your Dog

A dog drinking from a puddle
Just before the holidays, the New York City Department of Health and Mental Hygiene released its annual report to veterinarians on an important infectious disease, leptospirosis. As a New York City veterinarian, this report concerns me, and pet owners should be concerned too. Following several years of declining infection numbers, cases ticked up in 2022, the latest year data was available. In total, there were 20 confirmed “lepto” cases in the five boroughs in 2022, up from 18 in 2021. (To see previous years’ reports, visit the NYC DOH website.) Leptospirosis causes kidney failure and elevated liver tests, which may require hemodialysis and may be fatal. This blogpost describes some important features of canine leptospirosis.