La canine filariasis, Also called heartworm disease o heartworm diseaseIt is a serious parasitic disease caused by a nematode called Unforgiving heartwormsTheir larvae, after passing through a mosquito, transform into adult worms that lodge in the heart, pulmonary arteries and even in large blood vessels, progressively compromising the dog's cardiopulmonary health. These parasites feed on the nutrients the animal absorbs, weakening it and endangering its life if action is not taken in time.
This is a disease that can be very serious and potentially fatal, so we are going to explain it to you in detail. How to tell if your dog has heartworm, how it is transmitted, what symptoms it produces, how it is diagnosed, what treatments exist, and how to prevent it so that, if she suffers from it, she can recover as soon as possible.
How is filariasis spread?
This parasitic disease It is transmitted through the bite of a mosquitoThe insect must have previously bitten an infected animal (usually a dog) to acquire the parasite. microfilariae (larvae that circulate in the blood). Inside the mosquito, these larvae develop into a stage capable of causing infection.
When that infected mosquito bites a healthy dog, deposits the larvae in the skinFrom there, the larvae penetrate the organism, entering the bloodstream and begin a migration that lasts several weeks until they reach the heart or pulmonary arterieswhere they grow into adult worms that can reach 20-30 cm in length.
Importantly, It is not transmitted through direct contact between dogsnor for sharing water, food bowl or toys. The only means of transmission is through the mosquitoTherefore, any dog that lives in or travels to areas where there are mosquitoes is potentially at risk if it is not properly protected.
Besides dogs, dirofilariasis can affect other mammals (such as cats) and, very sporadically, humans, although in people it does not usually produce the same serious disease as in dogs.
What are the symptoms of canine filariasis?
One of the major problems with this disease is that, By the time we notice symptoms in the dog, a long time has passed since the infection.Filariasis is a silent enemy: it can take a long time to develop. months or even years in giving clear signs, because it is necessary for a significant number of adult worms to accumulate in the heart and lungs.
Therefore, we must always be alert to any small change in routine, behavior, or exercise toleranceSymptoms can vary depending on the number of parasites and the degree of cardiopulmonary damage, but they usually include:
- Lack of appetite and progressive weight loss.
- Mild or dry coughpersistent, which does not seem to get better and which usually worsens after exercise.
- Tired easily e exercise intoleranceThe dog gets tired quickly on walks or games that it used to do without a problem.
- General discomfortapathy and less desire to move or interact.
- Acceleration of respiration, difficulty breathing or intense panting even with mild exertion.
In more advanced stages, other signs may appear, such as fainting after the exercise, nasal bleeding, abdominal swelling due to fluid accumulation (ascites), pale or yellowish mucous membranes, bleeding or data from heart failure and damage to organs such as the kidneys and liver. Without treatment, the dog can suffer from cardiac collapse or pulmonary thromboembolism that put their lives at risk.
Therefore, if you observe any of these signs, especially chronic cough, fatigue, or difficulty breathing in a dog that lives in or has traveled to areas with mosquitoes, it is essential to go to the veterinarian as soon as possible for a comprehensive review and specific tests.
Veterinary diagnosis: how to tell if your dog has heartworm
The diagnosis of canine heartworm should not be based solely on symptoms, as these can be confused with other respiratory or cardiac diseases. The veterinarian will use various diagnostic tools. specific tests to confirm or rule out infection:
- Blood Tests to detect parasite antigens and/or the presence of microfilariae circulating in the bloodstream.
- Chest X-rays to assess the condition of the lungs and the heart and detect possible injuries.
- Echocardiography (cardiac ultrasound) to visualize adult worms in the heart chambers and large vessels, and to assess the degree of cardiac involvement.
- Complete analySIS (hematology, biochemistry, urinalysis) to determine if there is damage in kidneys, liver, or other organs and to be able to plan the treatment safely.
With this data, the professional can classify the severity of the disease (mild, moderate or severe) and choose the most appropriate therapeutic protocol, assessing the risk of complications such as pulmonary thromboembolism.
Can canine filariasis be treated?
Fortunately, Yes, it can be treatedBut the treatment will vary depending on the case, the parasite load, and the dog's overall health. It's not a simple routine deworming, but a process. long, delicate, and must always be supervised by the veterinarian.
If it has been detected in time and there is only larvae or a few wormsThe veterinarian may recommend:
- Antiparasitic pills or chewable tablets to eliminate the immature forms of the parasite.
- Specific adulticide injections to gradually eliminate adult worms from the heart and pulmonary arteries in a controlled manner.
- Many protocols include antibiotics to act against bacteria associated with the parasite (such as Wolbachia) and reduce inflammation.
In more advanced cases, with a large number of adult worms and signs of heart failure or thromboembolism, the following may be necessary:
- First, stabilize the dog with cardiac medication, diuretics and intensive care before applying the adulticide treatment.
- Reduce as much as possible exercisekeeping the dog in almost complete restbecause the death of the worms can generate clots that obstruct pulmonary vessels.
- In extreme situations, resorting to a surgery to manually remove filariae from the heart and great vessels.
Throughout the entire process, the tutor's collaboration is essential: following the guidelines in detail, attending the periodic checks and strictly respect the physical rest They make the difference between successful treatment and serious complications.
How to prevent canine filariasis?
Preventing this disease is much simpler and safer than treating it once it has taken hold. Preventing filariasis is very easy: you only need to take your dog to the vet for a check-up. blood testAnd, if he's healthy, we'll have to give him one. antiparasitic pill per month to prevent parasitic infections.
Today there are several very effective tools for Heartworm prevention which the veterinarian will choose according to the needs of each dog:
- Monthly tablets or pills that eliminate the larvae before they become adult worms.
- Extended-release injections applied in the clinic, which offer protection for several months with a single dose.
- Antiparasitic collars and pipettes that help repel mosquitoes and other external parasites (fleas, ticks), always as a complement to specific prevention against filaria.
In addition to preventative medication, it is very important to reduce contact with mosquitoes:
- Avoid, as far as possible, areas with stagnant watermarshes, rivers or wetlands during peak mosquito activity hours.
- Limit walks to sunrise and sunset, when mosquitoes are most active.
- Keep the dog's home and surroundings free of mosquito breeding grounds (containers with water, puddles, etc.).
In high-risk areas, veterinarians recommend carrying out a filariasis test once a yearIn this way, prevention can be started or adjusted by knowing if the dog is free of parasites and detecting any infection early.
Canine filariasis is a treatable disease, and above all, It can be prevented almost 100%. With a good parasite control plan, mosquito control, and regular checkups, protecting your dog from heartworm is a very direct way to care for their heart and lungs and ensure a long, active, and happy life. Don't neglect this.
