Leptospirosis is a bacterial infection spread through water or soil contaminated by the urine of infected animals, such as wildlife or livestock. Pets, particularly dogs, can contract it by drinking contaminated water or walking through wet areas. Symptoms include fever, vomiting, muscle pain, and, in severe cases, organ damage. To protect pets, avoid allowing them to drink from stagnant water, keep them away from potentially infected wildlife, and consider vaccinating them, especially if they spend a lot of time outdoors or in areas prone to the bacteria.