Leptospirosis is a waterborne bacterial infection that can be spread between water sources by mice, rats and other rodents. Dogs can become infected after the bacteria enters the body via cuts, abrasions or through membranes of the mouth, nose or eyes. The bacteria can infect several organs in the body, especially the kidney and the liver. This leads to varied clinical signs such as lethargy, vomiting, diarrhoea, yellow eyes and mouth and changes on bloods. This can lead to a critical illness that is often fatal even with extensive treatment. Leptospirosis is also a zoonotic condition, meaning that there is a potential risk for people to become infected. This can occur when they are exposed to the infected urine of affected animals.