When heartworms die after treatment, they break apart and travel through the bloodstream to the lungs, where they lodge in small vessels, causing blockages (thromboembolism), and are then slowly reabsorbed by the body over weeks to months, requiring strict rest to prevent severe complications like coughing or breathing issues.
Unlike intestinal parasites that can easily exit your dog's body, dead heartworms do not have such a straightforward exit. They must be absorbed internally as they die and float through the bloodstream.
When adult heartworms die, they begin to decompose. As they break up, they're carried to the lungs, where they lodge in smaller blood vessels and are eventually reabsorbed by the body. This process can take anywhere from several weeks to months.
Signs of Heartworm Disease in Dogs
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.”
Stage 4: Severe Disease and Life-Threatening Complications
The most serious stage of heartworm disease can be life-threatening. In severe cases, worms can block blood flow, leading to a sudden emergency known as caval syndrome. Immediate surgical intervention is often required to save the pet's life.
Heartworm is not necessarily painful for dogs, but it is uncomfortable. This discomfort is primarily due to the inflammation it causes in the heart and the lungs.
The adult worms die in a few days and start to decompose. 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.
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. Reactions to the drugs are not uncommon, and there is always some risk involved in treating a dog for heartworms.
In dogs, heartworm disease has four stages:
Melarsomine dihydrochloride (available under the trade names Immiticide and Diroban) is an arsenic-containing drug that is FDA-approved to kill adult heartworms in dogs. It's given by deep injection into the back muscles to treat dogs with stabilized class 1, 2, and 3 heartworm disease.
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.
" Heartworm preventives do not kill adult heartworms. 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.
It takes several months for the body to absorb the decomposed heartworms. Most problems after treatment occur due to these decomposing fragments. To reduce the risk, your dog should avoid exercise and be kept calm for the first month after treatment.
The temperature cannot drop below 57°F during this time frame or either the mosquito will die or the development of the heartworm will stop.
Heartworm disease in dogs is not just another parasitic infection—it is a progressive, life-threatening condition that can silently damage the heart, lungs, and surrounding vessels. Many pet owners delay action because early symptoms are mild or nonexistent.
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.
Along with coughing, the areas around the blood vessels in the lungs will begin to retain fluid, making it harder for your dog to receive oxygen, resulting in shallow, more rapid breaths. Distended chest. A swollen, bulged, or distended chest is typically a symptom of an adult heartworm infection.
What are the signs of mourning? When a dog loses a companion, whether animal or human, he grieves and reacts to the changes in his life. Dogs alter their behavior when they mourn, much like people do.
Heartgard is the safest heartworm prevention for heartworm positive dogs; it is important to remain on heartworm prevention throughout your dog's life. Your dog is on Heartgard for 2-3 months prior to initiating treatment because it kills some of the circulating larval forms before they become adult worms in the heart.
Swollen Belly
This is because the presence of heartworms can result in fluid accumulation in the belly by obstructing blood flow in the arteries that supply the liver and other organs. The dog may appear to have a rounded or bloated stomach, and it may also be uncomfortable or in pain.
Although very rare, it is not unheard of for heartworm infestations to penetrate the brain. If this happens, your dog may experience neurological symptoms including blindness, confusion, and seizures.
The most severe and life threatening cases are at the “end-stage” of the disease, which we refer to as caval syndrome. In caval syndrome the patient will typically have discolored urine, a heart murmur, right-sided and possibly left-sided congestive heart failure, and rapid or difficulty breathing.
No, heartworms are not passed in faeces like some other worms. How do humans get heartworms from dogs? The same as with dog to dog transmission, humans can only get heartworms through mosquito bites. Heartworms don't like to live in humans so cases are very rare.
Dogs who have been struggling with heartworms for a long time simply do not feel like eating, and some may begin coughing uncontrollably when they try to eat. For this reason, affected dogs may lose weight fairly quickly.