According to the American Animal Hospital Association (AAHA), leptospirosis, commonly referred to as “lepto,” is now considered a core vaccine for all dogs, meaning every dog should be vaccinated against it, regardless of lifestyle or location, as it is a potentially life-threatening disease that can be transmitted to humans (zoonotic) and is prevalent across North America.  Vaccination is the best way to protect your dog and yourself from leptospirosis.