4. Heartworm Disease

Another serious dog issue that can lead to death if it’s not treated properly is heartworm disease. As bad as it sounds, this affects the dog’s heart and, in the end, might infest the lungs as well. This disease is typically asymptomatic, which means your dog will show no signs of illness, but if symptoms do show up, they are usually: coughing, weight loss, and difficulty breathing.

Fortunately, there is a medication that can kill the worms. Good news, right?

To remember: If your dog is suffering from caval syndrome, unfortunately, surgery is the last option available.