Heartworm in dogs & cats
Published on 28 Apr 2021
Year-round heartworm prevention is an important part of routine care for most Australian dogs and cats.
Heartworm is transmitted by mosquitos and can be a serious and even deadly disease.
How is heartworm transmitted?
Mosquitoes transmit heartworm. When a mosquito bites an infected dog, the immature stages of the heartworm called microfilariae, are transmitted to the mosquito. These microfilariae develop in the mosquito and can be transmitted to other dog and cats when the mosquito bites them. Once infected, the heartworms continue to develop within the host and infect the heart, lungs and associated blood vessels.
It is important to note that heartworm disease in cats is very different to heartworm disease in dogs. The cat is not the typical host for heartworm and on many occasions the worms do not survive to the adult stage.
Although adult worms are concerning, even the immature worms can cause severe clinical disease, in cats this is referred to as heartworm associated respiratory disease.
Who is affected?
Any dog or cat can be infected with heartworm disease.
What are the signs of heartworm disease?
The signs of heartworm disease vary between dogs and cats. Heartworm is considered a disease with a slow onset and it may take many months (and in some cases years!) for clinical signs to be present.
|Feline||Vomiting, weight loss, coughing and/or asthma like attacks, decreased appetite, collapse, death|
|Canine||Exercise intolerance, coughing, lethargy, decreased appetite, weight loss, distended abdomen. Dogs with large numbers of worms can develop blockages of blood flow in the heart leading to collapse|
Management of heartworm
Preventing heartworm in pets is the best option to ensure your pet protected against them.
This means regular worming with a reputable brand of heartworm preventative medications according to the schedule that your vet recommends.
For adult pets, this generally means administering monthly heartworm prevention. An annual heartworm preventative injection for dogs is also available from your vet. If in doubt, speak to your vet who will be able to recommend an appropriate worming product for your pet. Prevention is safe, effective and more affordable than cure.
Even when a pet is on regular heartworm prevention, annual testing for heartworm is recommended
In cases where a pet is sick due to heartworm, management relies on administering an appropriate anthelmintic (antiparasitic medications), as well as supportive care to manage the symptoms. Your veterinarian will be able to discuss the best treatment plan for your pet with you.
How much does it cost to treat?
According to PetSure claims data in 2020, the average single treatment cost relating to Heartworm was $258 with the highest single treatment cost being $884.
Disclaimer: Reimbursement for these claims would be subject to limits, such as annual benefit limits or sub-limits, benefit percentage, applicable waiting periods and any applicable excess. Cover is subject to the policy terms and conditions. You should consider the relevant Product Disclosure Statement or policy wording available from the relevant provider.
- American Heartworm Society, “Heartworm Basics”, accessed on 27/11/20
- NexGard, “What is Heartworm Disease”, accessed on 27/11/20
- Greencross, “Heartworm Signs, Treatment and Prevention”, accessed on 27/11/20
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