Leptospirosis – a Threat to Your Dog’s Health 3/27/17 (Update: Leptospirosis on the rise around the United States. Here is a recent report from New Jersey.) Leptospirosis (“Lepto”) is a disease caused by a spiral-shaped bacteria that is found worldwide. Infections can affect people as well as many kinds of animals including dogs. Leptospirosis thrives in warm, moist areas (especially in stagnant water). While Arizona has not typically been associated with leptospirosis in the