Heartworm treatment for dogs diagnosed with adult heartworm infection involves the use of medications prescribed by your veterinarian. Treatment is not without risk, so it's important to commence prevention treatments straight away to ensure they do not become re-infected.
Recovery is possible — but it takes time, commitment, and close monitoring. Treating heartworm is a multi-step process, typically lasting several months. The goal is to kill the adult worms without causing dangerous complications and to minimize permanent damage to your dog's heart and lungs.
Signs of Heartworm Disease in Dogs
Fast kill starts with 30 days of doxycycline (antibiotic) to weaken/kill a bacteria like organism that is symbiotic with heartworms. This in turn weakens the heartworms.
There isn't a natural cure for heartworm in dogs, except the death of the dog. 'Natural' preventatives in common use for parasitic worms don't work on heartworm. Once a dog has heartworm, it will eventually die unless the condition is effectively treated by a vet.
How long can a dog live with heartworms? Dogs are able to live for years with this parasite, however, their condition will continuously worsen. It's a dangerous disease overall, which is why some people have even described untreated heartworms as the “slow kill.”
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Restrict exercise.
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.
Additionally, even though melarsomine is highly effective, a single course of treatment may not completely clear all dogs of infection (the American Heartworm Society protocol calls for three separate injections of melarsomine.
Key takeaways: Heartworm treatment for dogs typically costs between $500 to $6,000.
Also bring a fresh stool sample for them to check for the presence of worms. Finding microscopic intestinal worm eggs in the stool is the most common way to diagnose worms in dogs. Heartworms are diagnosed with a blood test, an X-ray of the chest, or an ultrasound of the heart.
Dogs of any age, breed or sex may be affected. The disease is rare in dogs less than one year of age, however, because the microfilariae take 5 to 7 months to mature into adult heartworms after infection.
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.
The first 7 -10 days after heartworm treatment are the most dangerous. But your dog is not out of the woods for several weeks more. These side effects are happening because the dead worms are breaking up and being carried into the lungs where they cause severe inflammation. With time, the body absorbs them.
Moxidectin-doxycycline (moxi-doxy) provides a viable alternative to no treatment at all, in cases where arsenical treatment is not possible. Based on current evidence, the most effective non-arsenical treatment regimen is doxycycline 10 mg/kg PO q 12 or 24 h for 28 days, combined with topical moxidectin at label dose.
In dogs, heartworm disease has four stages:
The 3-3-3 rule for dogs is a guideline for the adjustment period after adoption, outlining three phases: 3 Days (decompression, feeling overwhelmed/scared), 3 Weeks (starting to settle in, learning routine, personality emerges), and 3 Months (feeling secure, bonded, and truly at home). It helps new owners manage expectations and be patient as their rescue dog transitions, emphasizing calm energy, routine, and space in the early days to build trust.
Anecdotal evidence suggests that herbs such as garlic, black walnut and wormwood, and the homeopathic heartworm nosode, may actually prevent as well as treat infection. Unfortunately, I have not yet been able to find substantive proof that these therapies can reliably and safely prevent or treat infection or disease.
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.
What are the signs in my dog that would indicate they may have heartworms?
Apples: Apples are great for dogs with heartworms due to their high levels of vitamin A, vitamin C and fiber. Apples in your dog's diet may help repair damaged tissue and blood vessels and support the health of their vital organs.
That means your dog should be restricted to a very small area at all times throughout the entire treatment period (the use of a small cage or crate may be necessary), and continuing for 6 to 8 weeks after the last injection of melarsomine (the drug that kills adult heartworms).
There's no single "number 1" healthiest dog food, as the best choice depends on your dog's age, breed, and health; however, look for foods meeting AAFCO standards (Association of American Feed Control Officials), with real meat as the first ingredient, and vet-recommended brands like Hill's Science Diet, Purina Pro Plan, and Royal Canin are often cited for balanced nutrition. Freshly prepared or raw diets can also be healthy but carry risks, so always consult your vet.
The short answer to “Can I get heartworm medicine without a vet?” is no. Preventative medication to kill immature heartworm larvae will require a prescription from a veterinarian for several reasons. The Federal Food and Drug Administration regulates all medications, including heartworm preventatives for pets.
You should not put your dog's name, your full address, or the microchip number on their tag; instead, avoid the dog's name to prevent strangers from luring them, skip the full address for privacy/safety, and skip the microchip number as it's unnecessary and takes up space. Focus on your primary phone number and perhaps your surname or "Microchipped" for essential info to help a finder return them safely.