Treatment FAQ

how does heartworm treatment affect dogs

by Alisa Morar Published 2 years ago Updated 2 years ago
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Treatment for heartworm can cause serious complications for your pet's health and can be potentially toxic to the dog's body. Many dogs experience soreness and swelling at the site of their injections. The most severe side effects are related to a large number of worms suddenly dying.Aug 15, 2021

Full Answer

Does your dog really need heartworm medication?

Yes, you still need to give them the pill. If your dog is outside at all they need it. Heartworm isn't something to mess around with, the treatment for that is weeks of medication and bed rest. $130/year is nothing compared to how much it would cost to treat it, and is pretty cheap for Trifexis ($20/month here).

Will my dog survive heartworm treatment?

Treating heartworm is infinitely more difficult than preventing it. In fact, the period of treatment and recovery is not just long and strenuous, it’s also life-threatening. If you don’t play your cards right in the weeks to months of recovery post-treatment, you could lose your dog. No jokes. How Long After Heartworm Treatment Can A Dog Be Active?

Does My Dog Really need heartworm prevention?

Yes, your dog can get heartworms multiple times. For this reason, lifetime heartworm disease prevention can be important. It is highly recommended that you talk with your veterinarian about heartworm disease prevention before making a determination about what is best for your dog.

Should your dog be on heartworm medication?

The goal of any heartworm treatment is to:

  • Improve the clinical condition of the animal.
  • Eliminate all life stages of the heartworms (microfilariae, larval stages, juvenile and adult worms).
  • Minimize complications during and after treatment.

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What are the side effects of heartworm treatment in dogs?

Twenty-six dogs (52%) experienced minor complications, such as injection site reactions, gastrointestinal signs (vomiting, diarrhea, inappetance), and behavioral changes (lethargy, depression) during or after heartworm treatment.

Does heartworm treatment shorten a dog's life?

Although there's a risk involved in heartworm treatment, there's a greater risk in not taking care of the infestation. Once in a while, a dog succumbs during the course of heartworm treatment. However, he's almost certainly going to have a shortened life expectancy if heartworms are left alone.

Are dogs healthy after heartworm treatment?

Dogs with heartworm disease can live high-quality lives as long as they are given appropriate care. After completing treatment and following your veterinarian's recommenda- tions on heartworm disease testing and prevention, the chances of any long-term effects are very low.

What are the side effects of Immiticide heartworm treatment?

Common side effects include injection site irritation (accompanied by pain, swelling, tenderness and reluctance to move), coughing/gagging, depression/lethargy, anorexia/inappetence, fever, lung congestion and vomiting. All patients should be monitored during treatment and for up to 24 hours after the last injection.

How long will a dog live after heartworm treatment?

Dogs in this advanced condition have a life expectancy of only a few weeks or months. Thankfully, a new medication has been developed for killing adult heartworms while having fewer dangerous side effects.

What percentage of dogs survive heartworm treatment?

What is the treatment? There is some risk involved in treating dogs with heartworms, although fatalities are rare. "A new drug is available that does not have as many side effects, allowing successful treatment of more than 95% of dogs with heartworms."

Does heartworm cause permanent damage?

Even if heartworm infection is treated, we all know it does serious, permanent damage to the body. This in-depth look at that damage will renew your commitment to consistent prevention recommendations for your veterinary patients.

Why do dogs have to stay calm during heartworm treatment?

From the first injection until six to eight weeks following the last injection, it will be absolutely essential to keep your dog quiet. That means strictly restricting all exercise and activity that would elevate your dog's heart rate or increase his blood pressure.

How long does it take for heartworms to dissolve after treatment?

Once treated, the heartworms die slowly and begin to dissolve, taking several weeks. Three to four weeks later, your dog will begin phase two to get rid of the baby heartworms.

Can my dog jump on the bed after heartworm treatment?

There is no reason to allow running, jumping, or other physical activity at any time for 8 weeks after the start of the injectable heartworm adulticide treatment.

Is heartworm painful for dogs?

Unfortunately, treatment for heartworm disease can be difficult, costly, and painful for your dog. Here are five warning signs your dog may have heartworms.

What to Expect at The Vet’S Office

If your pet has been diagnosed with heartworm disease via a heartworm antigen test (the most common form of testing), this is what you can expect t...

Questions to Ask Your Veterinarian

As with any type of laboratory test, false positive and false negative results on heartworm tests are possible. In particular, dogs who have been b...

Possible Complications to Watch For With Heartworms

Side effects are common with heartworm treatment. Many dogs experience soreness and swelling at the site of melarsomine injections (the muscles on...

What to do if my dog has heartworm?

Restrict exercise.

How long does it take for a dog to get heartworm treatment?

In severe cases of heartworm disease, or when a dog has another serious condition, the process can take several months. Administer treatment.

Why is it important to restrict dog activities after heartworm diagnosis?

But your dog’s normal physical activities must be restricted as soon as the diagnosis is confirmed, because physical exertion increases the rate at which the heartworms cause damage in the heart and lungs.

Why does my dog's belly swell?

As heartworm disease progresses, pets may develop heart failure and the appearance of a swollen belly due to excess fluid in the abdomen. Dogs with large numbers of heartworms can develop a sudden blockages of blood flow within the heart leading to a life-threatening form of cardiovascular collapse.

What is the role of mosquitoes in heartworms?

The mosquito plays an essential role in the heartworm life cycle. Adult female heartworms living in an infected dog, fox, coyote, or wolf produce microscopic baby worms called microfilaria that circulate in the bloodstream.

What is heartworm in pets?

Heartworm disease is a serious and potentially fatal disease in pets in the United States and many other parts of the world. It is caused by foot-long worms (heartworms) that live in the heart, lungs and associated blood vessels of affected pets, causing severe lung disease, heart failure and damage to other organs in the body.

How many worms do cats have?

The cat is an atypical host for heartworms, and most worms in cats do not survive to the adult stage. Cats with adult heartworms typically have just one to three worms, and many cats affected by heartworms have no adult worms.

What is the best medicine for heartworm in dogs?

In addition to melarsomine, a number of adjunct medications are recommended in dogs undergoing heartworm treatment. These medications, which help improve treatment efficacy and minimize side effects, include: Steroids. Anti-inflammatory doses of steroids minimize clinical signs associated with pulmonary thromboembolism.

How long does it take for a dog to clear heartworm?

With this treatment, it can take upwards of a year for the dog to clear their heartworm infection.

What is the goal of heartworm treatment?

The primary goals of heartworm treatment are to minimize the clinical signs associated with heartworm disease and to eliminate all heartworms (adults, juveniles, larvae, and microfilariae) from the body.

How long should dogs be allowed to exercise after heartworm treatment?

Dogs should have their activity restricted before treatment, during treatment, and for two months after treatment.

How long to monitor heartworms?

Day 1: Administer heartworm prevention in the veterinary clinic, then monitor for 8 hours. Consider pre-treatment with antihistamines and/or steroids, to reduce reaction risk. Day 30: Owner administers heartworm prevention at home. Day 60: Owner administers heartworm prevention at home.

What are the signs of pulmonary thromboembolism in dogs?

Signs may include coughing, hemoptysis, shortness of breath, weakness/lethargy, or pale mucous membranes. If these signs are observed, the dog should receive immediate veterinary attention.

Can heartworm be detected in dogs?

Heartworm disease may be detected on routine health screenings — for example, when a heartworm test is performed at a dog’s annual veterinary wellness visit — or when a dog is test ed based on clinical suspicion. Regardless of how heartworm disease is diagnosed, prompt treatment is essential.

What causes heartworms in dogs?

It is caused by a blood-borne parasite known as Dirofilaria immitis. Adult heartworms are found in the heart, pulmonary artery, and adjacent large blood vessels of infected dogs. Rarely, worms may be found in other parts of the circulatory system. Female worms are 6 - 14" long (15 - 36cm) and 1/8" wide (3 mm).

What is the best medicine for dogs to get rid of heartworms?

An injectable drug, melarsomine (brand name Immiticide®), is given to kill adult heartworms. Melarsomine kills the adult heartworms in the heart and adjacent vessels. This drug is administered in a series of injections. Your veterinarian will determine the specific injection schedule according to your dog's condition.

How long can a dog live with heartworms?

Dogs in this condition are not likely to live more than a few weeks or months. Your veterinarian will advise you on the best treatment approach for dogs diagnosed with advanced heartworm disease. Treatment to kill adult heartworms. An injectable drug, melarsomine (brand name Immiticide®), is given to kill adult heartworms.

How long after heartworm treatment can dogs exercise?

This can be a dangerous period so it is absolutely essential that the dog be kept as quiet as possible and is not allowed to exercise for one month following the final injection of heartworm treatment. The first week after the injections is critical because this is when the worms are dying.

How does heartworm spread?

How is heartworm disease spread? Since transmission requires the mosquito as an intermediate host, the disease is not spread directly from dog to dog. Spread of the disease therefore coincides with mosquito season, which can last year-round in many parts of the United States.

What to do if my dog coughs?

If the cough is severe, notify your veterinarian for treatment options. Prompt treatment is essential if the dog has a significant reaction in the weeks following the initial treatment, although such reactions are rare.

How long does it take for a dog to get an injection?

Your veterinarian will determine the specific injection schedule according to your dog's condition. Most dogs receive an initial injection, followed by a 30-day period of rest, and then two more injections that are given 24 hours apart.

How to tell if a dog has heartworms?

The most severe problems that are seen after heartworm treatment in dogs are related to the sudden death of large numbers of worms. Call your veterinarian immediately if you notice any of the following: 1 Your dog develops a cough or a preexisting cough becomes worse 2 Your dog has difficulty breathing or pants excessively 3 Your dog becomes weak or lethargic or collapses 4 Your dog’s appetite significantly decreases 5 Your dog begins to vomit or drool excessively or develops diarrhea

How long does a dog grow with heartworms?

Once there, they can grow to be up to a foot long. It is possible for one dog to be infected with hundreds of heartworms. If not treated properly, heartworms in dogs will lead to serious health complications and death. This is why it is so important to keep your dog on continuous heartworm prevention.

What test is done for heartworms in dogs?

If no microfilariae are found, a confirmatory test for adult heartworms should be run by sending a sample to an outside lab. Complete blood cell count, blood chemistry tests, a urinalysis and chest X-rays to assess your dog’s overall condition and plan ...

How long does it take for Melarsomine to kill heartworms?

Restrict exercise and closely monitor for side effects for the next 30 days. Give the second injection of melarsomine 30 days after the first. Give the third injection of melarsomine one day after the second.

Can a dog get a heartworm test negative?

In particular, dogs who have been bitten by a heartworm-infected mosquito within the last six months will test negative until their heartworms mature.

Can heartworms kill dogs?

While the treatment of heartworms in dogs can cause serious side effects, heartworms kill dogs if left untreated. Prevention, on the other hand, is easy and well-tolerated by most dogs. By preventing heartworms in the first place, you can save your dog from a long and difficult treatment process.

Can dogs be crated for heartworms?

The most important aspect of home care for dogs undergoing treatment for heartworms is exercise restriction. Dogs should be crated when a responsible adult is not able to prevent excess activity. Dogs should only be allowed outside for short on-leash walks to urinate and defecate .

How do you know if your dog has heartworms?

When you do start seeing signs of heartworms in dogs, it’s due to two factors: 1 The damage the worms cause to the arteries in the lungs (pulmonary arteries) 2 The obstruction of blood flow that results from inflammation and the number of heartworms present

Why does my dog cough when he has heartworms?

Due to the inflammation, blood vessel obstruction and fluid accumulation, you will start to see the “heartworm cough.”. Your pet may also display exercise intolerance, nosebleeds, shortness of breath and weight loss. The smaller your pet is, the fewer worms it takes to cause these problems.

What is the obstruction of blood flow that results from inflammation and the number of heartworms present?

The obstruction of blood flow that results from inflammation and the number of heartworms present. Another complication some animals develop is similar to an allergy to the heartworms, or to the microfilariae, which can cause varying signs that are similar to allergies or asthma.

What causes a dog to have a lot of blood in its body?

Blood Flow Blockages and Fluid Accumulation. The mass of heartworms in your dog’s body can cause significant blockage to the normal flow of blood. Depending on the size of your dog’s blood vessels, even one worm can cause significant damage.

What is the source of heartworms?

Heartworm disease begins with an infected animal, known as the source, that has microfilariae (immature larval heartworms) circulating in their blood. When a mosquito bites the animal, they will inadvertently also suck up a number of microfilariae.

How long does it take for a heartworm to grow?

The majority of juvenile adult heartworms arrive in the heart by 90 days, where they grow rapidly in length and size. Males can grow to be 6-7 inches long, while females can grow to be 10-12 inches long.

Can a dog with heartworms live a long life?

A dog with heartworms will not live a long or healthy life—treatment is required for their survival.

What is Heartworm Disease?

Heartworm disease is caused by an infection with a parasite called Dirofilaria immitis. This parasitic nematode is known to affect many animal species, but its ideal host is the dog. Dirofilaria immitis invades the heart, lungs, and nearby blood vessels of the dog, which can eventually lead to death. 1

Cause of Heartworm Disease in Dogs

Heartworm disease is transmitted between animals by way of the mosquito. First, a mosquito bites a dog or other animal that is infected with heartworm microfilariae (immature heartworm larvae) in the bloodstream.

Treatment

Dogs positive for heartworm disease first undergo diagnostic testing to help determine the severity of the disease. This typically includes lab work and radiographs but may vary depending on the clinical signs, if any. Dogs with severe disease may not survive treatment and are often not considered eligible for treatment.

How to Prevent Heartworm Disease in Dogs

You can spare your dog (and your bank account) from the risky treatment process by taking actions to prevent heartworm disease from occurring in the first place. Talk to your vet about the best heartworm prevention plan for your dog.

How many dogs are infected with heartworms?

Heartworm medication for dogs is used as a preventative for this debilitating disease, which is completely preventable with medication but still infects more than 250,000 dogs annually.

What is the best medicine for heartworm?

Adulticide, melarsomine and thiacetarsamide are medications, often given in a series of injections, that treat heartworm once it is contracted. Though these have side effects, they are often necessary once the disease has been contracted since there is no other cure.

Can heartworm cause dilated pupils in dogs?

Symptoms of overdose include loss of coordination, dilated pupils and trouble breathing. Because heartworm symptoms may not appear until the disease has already advanced, preventative medicine is best way to keep your dog safe. As with any medication, there are side effects and health problems related to long-term use.

Does a dog's immune system weaken after taking a preventative pill?

This also weakens the immune system so dogs are more susceptible to disease shortly after taking the pill, which is often given on a monthly basis. Additional side effects of the preventative pills include vomiting, diarrhea, weakness and seizures.

Can you give a dog a medication for seizures?

These medications should never be given to a dog who is prone to seizures without consulting a veterinarian. Dogs who are prone to medicine sensitivities may also have severe allergic reactions or behavioral symptoms such as increased irritability and aggression in the days immediately following the dosage.

Can heartworm medicine cause diarrhea in dogs?

Side Effects of Canine Heartworm Meds. Side effects for the treatment injections, particularly melarsomine and thiacetarsamide, can be nasty, including diarrhea, vomiting, loss of appetite and jaundice. Dogs are routinely hospitalized for heartworm treatment, so they can be treated for the side effects as well.

How to treat heartworm in dogs?

Heartworm treatment consists of killing both the mature heartworms and the babies, known as the microfilariae. Your dog will receive oral medication to kill off the immature worms. To kill adult worms, your vet injects Melarsomine into the deep muscles in the dog's lumbar region, either two or three times. The second and third injections follow the first by a month. Spacing the drug out helps prevent the dog from going into shock because of a huge worm die-off. Melarsomine is the only currently approved Food and Drug Administration pharmaceutical for killing grown heartworms. The injection site may swell or bother your dog for a few days.

What happens if a dog has heartworms?

If your dog has been diagnosed with heartworms, the most difficult part comes after the vet gives your dog medication to kill these parasites. You are responsible for keeping your dog quiet for a prolonged period -- a difficult task if your dog is young and active.

How long does it take for worms to go through a dog's heart?

The worms work their way through the animal's bloodstream, ending up at the heart approximately six months after that initial infecting mosquito bite. At maturity, heartworms can be up to a foot long, although most top out at about half that length. If your dog tests positive for heartworms, your vet will discuss the best way to treat him given ...

How long after worm injections can dogs be inactive?

For a month after each injection, you must keep your dog as quiet and inactive as possible while the heartworms within him die off. That's two months of rest, no recreation. You might need to keep him in a crate or cage. As much as he hates it, remember it's for his own good. Keep walks to a minimum, just long enough for him to do his business. Discourage visitors if possible, as they may get him excited. If he becomes active and his heart rate increases, the dying worms inside his body may kill him as they break up.

Why do dogs need to be spayed out?

Spacing the drug out helps prevent the dog from going into shock because of a huge worm die-off. Melarsomine is the only currently approved Food and Drug Administration pharmaceutical for killing grown heartworms. The injection site may swell or bother your dog for a few days.

Can a dog get heartworms from a vet?

In severely affected dogs, surgical extraction of large worms may be performed by your vet before the dog receives drugs to kill off the remaining heartworms . The vet must view echocardiograms of the dog's heart and pulmonary arteries to determine whether the worms are in area accessible to the surgeon, according to the American Heartworm Society. When the dog recovers from his surgery a few weeks later, he can begin receiving the injectable heartworm medications.

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Other animals

Life cycle

  • The mosquito plays an essential role in the heartworm life cycle. Adult female heartworms living in an infected dog, fox, coyote, or wolf produce microscopic baby worms called microfilaria that circulate in the bloodstream. When a mosquito bites and takes a blood meal from an infected animal, it picks up these baby worms, which develop and mature into infective stage larvae over …
See more on heartwormsociety.org

Symptoms

  • In the early stages of the disease, many dogs show few symptoms or no symptoms at all. The longer the infection persists, the more likely symptoms will develop. Active dogs, dogs heavily infected with heartworms, or those with other health problems often show pronounced clinical signs. Signs of heartworm disease may include a mild persistent cough, reluctance to exercise, f…
See more on heartwormsociety.org

Epidemiology

  • The fact is that heartworm disease has been diagnosed in all 50 states, and risk factors are impossible to predict. Multiple variables, from climate variations to the presence of wildlife carriers, cause rates of infections to vary dramatically from year to yeareven within communities. And because infected mosquitoes can come inside, both outdoor and indoor pets are at risk.
See more on heartwormsociety.org

Prevention

  • For that reason, the American Heartworm Society recommends that you think 12: (1) get your pet tested every 12 months for heartworm and (2) give your pet heartworm preventive 12 months a year.
See more on heartwormsociety.org

Diagnosis

  • Heartworm disease is a serious, progressive disease. The earlier it is detected, the better the chances the pet will recover. There are few, if any, early signs of disease when a dog or cat is infected with heartworms, so detecting their presence with a heartworm test administered by a veterinarian is important. The test requires just a small blood sample from your pet, and it work…
See more on heartwormsociety.org

Treatment

  • No one wants to hear that their dog has heartworm, but the good news is that most infected dogs can be successfully treated. The goal is to first stabilize your dog if he is showing signs of disease, then kill all adult and immature worms while keeping the side effects of treatment to a minimum.
See more on heartwormsociety.org

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