Canine heartworm: prevention, signs and care
23/09/2025
Index
Introduction
Heartworm in dogs is one of the most concerning diseases that can affect a dog's health. Caused by parasites transmitted by mosquitoes, this illness compromises the animal's cardiovascular system and can have serious consequences if not diagnosed and treated in time.
Although many people are still not fully aware of this problem, it is essential to understand how it develops and what measures can be taken to protect our four-legged companions. After all, information is the best tool to ensure quality of life and well-being.
What is dog heartworm?
Dog heartworm, also called dirofilariasis , causes a parasitic disease, settling in the animal's heart and pulmonary arteries. Transmission occurs when a mosquito bites an infected dog and then transmits the larvae to another healthy dog.
This silent cycle can last for months before symptoms appear. Therefore, prevention is considered the most effective way to deal with this condition. This depends mainly on the awareness of pet owners, especially when they live in or take their dog on vacation to places where the problem is highly prevalent.
Most common symptoms of the disease
The signs of canine heartworm can vary depending on the stage of infection. Among the most frequent symptoms are persistent cough, fatigue after light activity, difficulty breathing, and weight loss. In more severe cases, heart failure and even sudden death can occur.
It is important to highlight that, often, symptoms only become evident in advanced stages of the disease. Therefore, preventive examinations and regular check-ups with veterinarians are essential measures to detect this parasite before it compromises the animal's health.
Diagnosis and treatment available
Specialized blood tests can diagnose heartworm disease, revealing the presence of the parasite. In some cases, imaging tests are also requested to assess the degree of heart and lung involvement.
Treatment varies and may include medication to eliminate adult worms and larvae, as well as supportive care to minimize damage to the body.
However, the most effective type of treatment is prophylactic, because the larvae cannot survive in the bodies of dogs with high blood concentrations of specific dewormers. Thus, it is much more efficient than interventions performed when the worm is already an adult, which coincides with the moment when clinical signs appear.
However, it's important to keep in mind that the process can be lengthy and requires constant veterinary monitoring. Therefore, prevention is still the best approach against canine heartworm.
Prevention of heartworm in dogs
Prevention against canine heartworm is essential, as the disease can cause serious health complications for the animal. The most commonly used medication for prevention is ivermectin; however, not all dogs can receive it.
Some animals have a genetic condition called Multidrug Intolerance (MDR1), which makes them extremely sensitive to ivermectin and other medications.
This condition can only be identified through a genetic test, such as those available at Petgenoma. It is present in dogs of all breeds, including mixed breeds. It is especially common in breeds such as Border Collies, Shetland Sheepdogs, and Australian Shepherds.
The use of ivermectin in dogs with this mutation can cause severe reactions and even lead to death. Therefore, before starting prevention, it is essential to talk to your veterinarian about the possibility of performing genetic testing.
If the condition is confirmed, the professional can suggest safe alternative options to protect the animal against canine heartworm.
In addition to using appropriate medications, it is also important to adopt mosquito control measures, such as keeping environments clean, free of standing water, and with adequate protection, reducing the risk of disease transmission.
The importance of regular checkups
Even in dogs that receive preventative treatment, regular checkups are essential to confirm that there has been no infection with canine heartworm. After all, this parasitic disease can develop silently, and only laboratory tests can identify the presence of the parasite in its early stages.
Therefore, routine veterinary check-ups should include both vaccinations and general check-ups, as well as specific evaluations to prevent heartworm disease. This practice ensures greater safety and allows for quick action if necessary.
How can genetics help with care?
Although canine heartworm is transmitted by mosquitoes, the body's response to the parasite can vary according to individual factors. In this sense, understanding a dog's genetics can offer valuable information about its predisposition to complications or its immune response to diseases .
In this case, rely on companies specializing in genetic testing for dogs, such as Petgenoma. We stand out by offering analyses that help personalize care for each animal. Thus, in addition to traditional prevention, the owner can adopt even more targeted strategies to protect their companion.
Meet petgenoma: your partner in genetic testing for pets.
If you are looking for a reliable and innovative solution to discover your cat's origin, identify predispositions, and provide a better quality of life, a cat DNA test is essential, and Petgenoma is the ideal company for this.
Specializing in pet genetics, petgenoma offers highly accurate tests, focusing on preventative medicine, breed identification, and disease predisposition. With our own laboratory and national database, we guarantee results with 98% accuracy using Illumina technology.
The process is simple: the pet owner collects the sample at home using a buccal swab, sends it to the lab, and receives the results within 15 business days, with full support throughout all stages.
The company offers different kits, geared towards dogs and cats. With the Breed Identification Kit , you have access to the pet's origin, confirmation of parentage, consanguinity, and physical characteristics.
Want more? Then you might be interested in the Premium Kit , which offers breed evaluation and also analyzes more than 300 diseases. There's also the Premium Clinical Kit , which provides all of that, plus analyzes your pet's oncological and obesity risks.
Therefore, if you want to deeply understand your pet and ensure a healthier life for them, count on petgenoma. Discover our products and find out how genetics can transform your relationship with your furry friend!
Conclusion
Canine heartworm is a real and silent threat, capable of seriously compromising the health of dogs.
Because it is transmitted by mosquitoes, the disease can affect any animal, regardless of breed or age. However, prevention and veterinary care make all the difference in avoiding serious complications.
The key is to invest in preventative care, regular checkups, and quality information. This is the most effective way to keep pets healthy and free from this parasite. Although this disease can be dangerous, with attention and responsibility you can ensure the well-being of your pets.
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