Leptospirosis
Dog retrieving in water, by Lord Bert
Leptospirosis is a bacterial disease that may cause mild infections in most dogs, but can cause inflammation of internal organs, leading to more serious complications…especially if the kidneys and liver are involved.
Dogs tend to come into contact with the bacteria through contaminated water sources, so dogs at highest risk are those who spend a lot of time outdoors and may be exposed to contaminated water or soil. Some veterinarians recommend that only dogs at risk of contracting leptospirosis be vaccinated.