Recent evidence indicates that feline heartworm disease is much more prevalent than was believed.
Cats - even indoor cats are vulnerable to heartworm infection which is transmitted by mosquitos. Heartworm disease in cats can be confused with other diseases. Symptoms include chronic cough, difficult breathing, vomiting, lethargy, blindness, and even sudden death. Diagnosis of heartworm disease in cats requires a special blood test. If your cat is positive for heartworms further evaluation and tests will be needed.