Allowing vigorous activity at any time in these 8 weeks can cause the weakened heartworms to shatter, causing a clot of worm fragments that blocks off blood flow to the lungs, brain, or other organs (“shaking the tree” phenomenon). This causes a stroke or sudden death.
Most dogs can be safely leash-walked during the treatment recovery period and providing appropriate chew toys can help relieve some of that stored up physical energy.
If the dog's heart rate is increased by exercise or excitement, the worm pieces can be forced into the tiny blood vessels of the lungs, increasing the chances of complications.
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. The more severe the symptoms, the less activity your dog should have.
If exercise or excitement cause the treated dog's heart rate to rise, pieces of decomposing worms can be forced into the tiny blood vessels of the lungs, causing further complications. The more pronounced the clinical signs of heartworm disease are, the more restricted any activity or excitement need to be.
The American Heartworm Society does state that exercise restriction should begin the same day the diagnosis is confirmed. Usually, my vet instructs me to keep my heartworm positive dog from engaging in any activity that elevates the heart rate until the end of treatment.
The heartworms will die over the next 6 weeks. As they die and are broken down, pieces of them could lodge in other parts of the body's blood vessels, causing unnecessary complications–if your pet's activity is too strenuous. THE FIRST 30 DAYS AFTER TREATMENT ARE THE MOST CRITICAL!
Strict rest is imperative for 6-8 weeks. This means that your pet can be leashed walked outside to urinate and defecated, but must come back inside to rest. Do not allow your pet to run, jump, climb stairs, or play rough with other dogs or children.
“No running, jumping, playing or high-impact exercise as these activities may cause the worms to break loose and cause significant harm to the pet being treated.”
The medicine in the treatment (Immiticide) can cause a lot of inflammation at the injection site. This can occur no matter how smoothly things go and how little it seems to bother the dog at the time. This can range from being absolutely undetectable to a dog that is crying constantly with pain.
Some dogs experience nausea and are lethargic. These symptoms will usually ease over a couple of days. Though some dogs do not experience the muscle soreness, it is important not to pick up the dog or put any pressure on the back for 2‐4 days after the injections.
Complete rest is essential during treatment.
This can be a dangerous period, so it is critical that your dog be kept as quiet as possible and is not allowed to exercise until one month following the final injection of heartworm treatment.
After treatment, the adult worms die and are carried by the blood to the lungs where they lodge in small blood vessels. There they decompose and are absorbed by the body over a period of several months.
Do the heartworm treatment injections hurt? The injections are given within the muscle and can indeed be uncomfortable, but the inflammation that develops within the days following creates the most discomfort. Restlessness, panting, trembling and reduced appetite can all be signs that the dog is uncomfortable.
Heartworm positive dogs should not exercise. From the day they are diagnosed and receive their first dose of heartworm preventive until the heartworm treatment is complete, the American Heartworm Society recommends that you restrict a dog's activity.
Prognosis: heartworm treatment success rates
With the three-dose adulticide protocol described above, in conjunction with doxycycline and macrocyclic lactones as recommended by the American Heartworm Society, 98% of dogs will be cleared of heartworm infection.
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.
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.
Additionally, you may see dead worms in your dog's stool for a few days following treatment, or your dog may have diarrhea as they digest the dead worms. Most of the time, regardless of what you see in their stool, recently dewormed dogs behave like normal.
Heartworms frequently cause dogs to become intolerant to exercise. You may notice that your previously active dog begins to slow down on walks or not run to the door when you grab the leash anymore.
Heartworm treatment is a process carried out through 4-6 months. During heartworm treatment the patient must stay confined while the heartworms are dying off to prevent embolisms and other health risks. We take necessary steps in assuring that your pet is healthy and stable before going through heartworm treatment.
Rest for 60 days (ideally in a crate): Rest is the single most important factor to successful heartworm treatment. This means 4 weeks of strict rest for your dog after each melarsomine injection.
Heartworms can also cause nosebleeds, pneumonia, high blood pressure, seizures, blindness, and excessive sleeping.
Treatment involves using very harsh arsenic-based drug to kill the adult heartworms. This medication is painful to administer and can lead to injection site reactions in some patients.