Dogs at risk of leptospirosis are those exposed to wet conditions or any type of standing fresh water including rivers, streams, or lakes. Another risk factor includes roaming in the same places as infected animals, including walking trails, dog parks, or even in your yard if infected animals such as racoons or rodents could be in the area. If left untreated, leptospirosis can lead to fatal kidney and/or liver failure. It is also a zoonotic disease, which means it can be transferred to people.