Yes, heartworm treatment is hard on older dogs, as the arsenic-based injections and strict rest required can be more challenging for senior bodies, potentially causing more side effects like lethargy, vomiting, and inappetence, though treatment is often still necessary and doable with veterinary guidance, sometimes using less invasive "slow kill" methods if appropriate. Prevention is always the best approach, but if infected, a vet will balance risks and benefits for older pets, potentially splitting treatments or using other methods.
Heartworm treatment can be dangerous and difficult, especially for older dogs. The dying worms can cause significant inflammation and pulmonary thromboembolisms (i.e. clots in the lungs). Plus, the melarsomine injections can be painful and the dog must be on strict rest for months.
Here's the problem with heartworm... the dewormer medicine kills the heart worms but they can be shed into the bloodstream. Vets recommend keeping dogs quiet after treatment because activity can cause the heart to pump harder and release more worms. This can lead to strokes if they travel to the brain.
The Importance of Year-Round Prevention
In Georgia, mosquitoes are active for much of the year, which means your dog could be exposed to heartworm-carrying mosquitoes at any time. Year-round heartworm prevention is the best way to ensure your dog is protected from this life-threatening disease.
Heartworm treatment can cause side effects such as lethargy, swelling, or vomiting due to the death of heartworms. Symptoms include coughing, fever, and loss of appetite. Treatment involves strict rest to prevent complications and medications like corticosteroids to reduce inflammation.
Lethargy or Fatigue – Many pets feel tired after treatment, especially while their body adjusts. Mild Coughing – As worms break down, some pets may cough more frequently. Injection Site Soreness – A little stiffness or tenderness where medication is given is normal.
Heartworm is a progressive, life-threatening disease. The earlier it is detected and treated, the better the chances that your pet will recover and have less complications. Dogs: As with most medical problems, it is much better to prevent heartworm infection than to treat it.
However, Heartgard Plus Chewables cannot prevent the development of the adult stage. Use with caution for collies and other herding dog breeds. These breeds have been known to have adverse reactions to ivermectin at elevated dose levels.
(CN) – A federal class action claims the makers of a popular heartworm medicine have ignored 7 years of warnings from the FDA and jeopardized the lives of thousands of dogs by continuing to misrepresent the drug as “100 percent effective.” The class claims Merial misrepresented its HeartGard Plus medication because ...
Heartworm preventatives work by targeting immature heartworm larvae soon after infection, stopping their development before they can settle in your pet's heart and lungs. Skipping a dose leaves an opening, however short, for those larvae to slip through and start growing undetected.
How successful is heartworm treatment? The 3-part injection of melarsomine is 98% effective at killing the adult worms. However, dogs who do not receive adequate rest after the injections are at risk for pulmonary embolisms, which can be fatal, due to dying worms blocking blood flow in the lungs.
If your dog loves to play throw the ball, don't do that for the couple months they're needing rest. If there are things that get your dog real excited around the house, jumping up and down on the couch, running around when the doorbell rings, try and limit those things.
The injections (called an Immiticide or Adulticide because it kills adult heartworms) are made in the lumbar region with a long needle; the Immiticide is an arsenic-based compound (though the modern compound has less arsenic than older compounds): it can hurt some dogs, cause pain to spread throughout the lower back ...
Most dogs who receive timely and appropriate treatment for heartworm go on to live full, healthy lives. However, if the disease was advanced, some may have lasting damage to the heart or lungs that requires ongoing care. That's why prevention is always the best medicine.
It has been shown that any dog can be infected regardless of age, and cases of core diseases are reported also in senior dogs [39,40,41]. For this reason, core vaccinations are considered the main tool to control these diseases.
As they break up, they are carried to the lungs, where they lodge in the small blood vessels and are eventually reabsorbed by the body. This resorption can take several weeks to months, and most post-treatment complications are caused by these fragments of dead heartworms.
Although there are fewer mosquitoes in the winter, there is still a risk that your pet could get heartworms if you stop giving heartworm prevention medication during this season. That's one reason veterinarians strongly recommend pets receive heartworm prevention medication year-round.
If you have a breeding dog, a pregnant dog, or a puppy between 6 and 8 weeks old, Heartgard Plus is the safest option. If you're hoping to find a broad-spectrum product that protects against fleas and ticks while it defends against internal parasites, Simparica Trio is the clear winner.
The leading cause of death in dogs, especially older dogs, is cancer (neoplasia), affecting about 1 in 4 dogs, similar to humans, with specific breeds at higher risk. Other significant causes include old age, heart disease, digestive disorders (like bloat), infectious diseases (like Parvo), and trauma, with sterilization influencing risks for cancer and infections.
Heartworm preventives do not kill adult heartworms. Also, giving a heartworm preventive to a dog infected with adult heartworms may be harmful or deadly. If microfilariae are in the dog's bloodstream, the preventive may cause the microfilariae to suddenly die, triggering a shock-like reaction and possibly death.
Some breeds of dog (e.g., collies, sheepdogs, and collie- or sheepdog-crosses) are more sensitive to ivermectin than others. This is typically due to a genetic mutation (MDR1) that makes them less able to tolerate high doses of ivermectin and other medications.
Certainly, drug-free strategies can help reduce the risk of heartworm transmission to a dog or cat. Because heartworms are spread by mosquitoes, keeping pets indoors overnight and avoiding walks at dusk or dawn when mosquitoes may be feeding can help prevent exposure to mosquitoes that could be carrying heartworms.
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.
5 Signs Your Dog May Have Heartworm Disease