Heartworm disease is one of the most common parasitic infections in Texas dogs. The disease is transmitted by mosquitoes. After ingesting blood from an infected dog, the Microfilaria (“baby” heartworms) are transmitted to another dog or cat when bitten by the mosquito. Once the heartworms mature, they begin reproducing more microfilaria. The microfilaria must be ingested by a mosquito before they can become infectious. The mosquito must then inject the heartworm larvae into a susceptible pet
Adult heartworms develop 3-6 months after being bitten by an infected mosquito.
Heartworms impair blood circulation resulting in damage to the heart, lungs, liver and kidneys. Serious damage may occur even before outward clinical signs are observed.
Advanced signs include difficult breathing, coughing, tiring easily, listlessness, weight loss and fainting.
Heartworms occur in all breeds of dogs: both large and small, indoor and outdoor, long haired and short haired.
Diagnosis of Heartworms is by a blood test. Annual blood tests are recommended by our Doctors and the American Heartworm Society for all dogs, including those on preventative medications.
Treatment is very successful when the disease is detected early. The adult worms are killed with an injectable drug given in a series of 2 injections. A few days later, the worms begin to die, and are carried by way of the bloodstream to the lungs where they lodge in small blood vessels. They slowly decompose and are absorbed by the body over a period of several months. Other medications are required to kill the microfilaria at a later time.
Heartworms can be prevented. All dogs should be on heartworm preventative all year long. We recommend Heartgard monthly chewable tablets as the product to prevent heartworms and control most internal parasites. For clients who desire to combine heartworm and flea control, we recommend Revolution.
