Since 1986 the veterinary staff at Pleasant Hill Animal Hospital has made heartworm prevention for dogs an important part of our approach to preventive care. A heartworm infection can lead to numerous health problems up to and including early death. Therefore, heartworm prevention cannot be ignored. Our team is here to educate you and protect your dog from this terrible disease.
Heartworm is spread through dogs via bites from infected mosquitoes. Living in GA, the presence of mosquitoes throughout the spring, summer and into the late fall months means greater chances for your dog to contract heartworms. Any outdoor time, whether your dog just has a potty break in the morning and evening, or your dog spends hours outside, puts your dog at risk for mosquito bites.Once a heartworm infestation occurs, it will become life threatening. Therefore, our goal is to implement a preventive program before your dog is exposed.
What Is Heartworm Disease?
Heartworm disease in dogs is just as it sounds. A long spaghetti like worm lodges in the chambers and blood vessels associated with the heart. They usually occur in large numbers, sometimes up to hundreds of worms.
Upwards of 30 species of mosquitoes can act as heartworm transmitters. Mosquitoes ingest immature heartworm larvae, called microfilariae, by feeding on either an infected cat or dog.
When an infected mosquito bites a dog, it injects larvae into a new dog. The larvae then mature over a period of several months, eventually ending up in the right side of the heart and the pulmonary arteries. Once this occurs, they mature into adult heartworms in dogs, and can reproduce starting about six months from the time of invasion. At approximately eight months after the invasion, heartworm in dogs begin to produce a new crop of microfilariae that will live in the dog's blood for about one month. By the time this occurs, many dogs are already experiencing damage and changes to their hearts and vessels, and their lives are in danger.
Heartworm Symptoms - The Four Stages Of Heartworms In Dogs
Heartworm symptoms in dogs are divided into four stages. It is important to understand that individual stages are not always clearly identifiable and some stages can overlap, but the following information will help educate you about the four major stages, as well as their accompanying heartworm symptoms. The four clinical stages of heartworm begin when your dog has already become infected and the heartworms are present in the dog's heart:
Stage 1: In dogs, the first stage of heartworm will typically be symptom free. In this stage, the heartworms are present and settling into the heart. However, in stage one the disease has not yet progressed to the point where the heartworms will have produced a new generation of microfilariae and dog's body will not yet have produced antigens in an amount sufficient for detection.
Stage 2: Stage two of heartworms in dogs is may show mild symptoms including intolerance for exercise and a more lingering cough. The heartworms have been present long enough in the body for antibody production and probable microfilariae production. During this phase, heartworm disease may be detected with blood tests.
Stage 3: By stage three of heartworms in dogs, the symptoms of the disease will be very noticeable and have a big impact on your dog's health. Dogs continue to cough and experience fatigue after exercise, may be reluctant to exercise at all, and can have trouble breathing. During this stage, dogs may also cough up blood. By stage three, the disease is quite evident on x-rays. Changes from thhe worms in the heart and large vessels will be obvious on x rays.
Stage 4: Dogs in stage four of heartworm disease have very visible heartworm disease symptoms. These symptoms are accompanied by long-term implications for the dog's health. These dogs are very ill. The symptoms are similar to Stage 3 but more severe. Dogs will be reluctant to exercise, tired after exercising, and will exhibit a cough. They will probably experience trouble breathing as well. They may have a swollen abdomen and sometimes coffee colored urine. These dogs are very fragile and death may be imminent. Testing may reveal the impact of the disease in the form of abnormal sounds within the dog's heart and lungs and an enlarged liver. Even with treatment, this stage of the disease carries a high risk of long term debilitation and possible death.
The severity of heartworms in dogs is directly dependent upon:
- The number of worms present in a dog's body
- The duration of the incubation
- The individual response of the infected dog, in fighting off the infestation
As heartworm disease progresses through each stage, treatment methods become increasingly invasive. This is a big reason why early detection plays a major role in the options and ability for your dog to recover. Remain aware of any changes in your dog's behavior. Keep an eye out for any changes in behavior that align with the symptoms of heartworm and if you do find that your dog is displaying symptoms that could be indicative of heartworm, it is important to make a veterinary appointment right away.
Unlike medications that are used to prevent heartworm in dogs, the medications that are used to kill or treat an advanced stage heartworm infection carry a higher rate of potentially serious side effects, can be painful for the dog and are costly to the owner. In addition, the treatment will require an extended time of very limited activity while the mecation slowly destroys the parasites and the dog's body excretes the particles microscopically.
Heartworm Prevention For Dogs
Heartworm prevention is given in the form of a monthly chewable or topical treatment. The chewables are readily accepted by most dogs as a treat. It is very important that the chewable be given once a month on the same day of the month to make sure that your dog is adequately protected. Side effects of the chewable medication are rare mostly occuring in dogs that carry a high load of the larval stage of the heartworm. The preventative is highly effective when given perfectly on schedule and absorbed properly. However, yearly heartworm testing is still reccomended even when a dog is taking the preventative. This is to protect the dog in the cases of breakthrough infection, as perfect dosing doesn't always occur. As with any medication, please call if you notice any changes in your dog's health or behavior.
What You Need To Know About Heartworm Treatments
The first thing to understand is that there is a significant difference between heartworm prevention and heartworm treatment. Prevention is simple to do and is effective in protecting your dog from heartworm disease. Treatment options are used for dogs that are already sick because they have become infected.
The first step in heartworm treatments is obtaining a diagnosis. Most veterinarians use a battery of tests to determine the presence of heartworms in dogs. The first step in diagnosis of heartworm in dogs is to perform a blood test.
A positive heartworm blood test in the first step in diagnosis. If the blood test comes back positive, then the following tests may also be performed to determine the stage and severity of the disease in order to determine the most appropriate treatment plan:
- An antigen test determines the presence of adult female heartworms
- Radiographs, or X-Rays to view the size and shape of a dog's heart. This is helpful because many dogs with heartworm develop enlarged pulmonary arteries, or have obstructions in the arteries leading to the lungs
- Sometimes and ultrasounds allows us directly view the internal structures of the heart and surrounding vessels, in order to assess the condition and function of the heart
During initial heartworm treatments, most patients are hospitalized to receive an adulticide, which is a medication that kills adult heartworms. The microfilariae in the body can be eliminated with a monthly prevention, which can be administered at home.
For more severe cases, such as dogs experiencing thromboembolic complications (in which a blood clot that has formed breaks loose and travels through the bloodstream to clot another vessel), hospitalization may be necessary for a longer period of time while heartworm treatments are administered. In some extreme cases, a surgical procedure may be necessary to remove adult worms from the right heart and pulmonary artery by way of the jugular vein. This procedure is recommended if the infestation consists of a high number of adult worms. This procedure can only be performed at a specialty or university hospital.
Ask Your Veterinarian About Heartworm Medicine For Dogs
It is important to consult your veterinarian when making preventive care decisions for your dog. This is true for a variety of reasons. There are many over the counter products on the market today that range from ineffective to outright dangerous. Our veterinarians are trained and qualified to help you make the best decisions regarding preventive care and treatment of any health conditions your dog may develop, especially when it comes to parasitic infections.
Schedule An Appointment To Diagnose Or Prevent Heartworm In Dogs
Heartworm is an easily preventable disease. If your dog is not currently using a veterinarian recommended heartworm prevention medication, please schedule an appointment right away. There is no reason for your dog to be exposed to heartworm disease, when prevention is so simple.