Hume Animal Hospital

02 6025 4088

Heartworm

There are two broad categories of worms that may affect our pet dogs and cats, heartworm and intestinal worms which a prevented seperately.  Please see our intestinal worm page for more information.

Heartworm

Heartworm, or Dirofilaria immitis, is a parasite that is spread by mosquitoes, so you pet does not even need to be in contact with other pets to become infected!

Heartworm has a complicated life cycle.  Infected dogs have microfilaria, an immature form of heartworm, circulating in their bloodstream.  Microfilariae are sucked up by mosquitoes when feeding on the blood of infected dogs. The immature parasite develops into a heartworm larva inside the mosquito, then a single bite from a carrier mosquito can infect your pet (dog or cat).

As the worms mature in the heart they can cause a physical blockage as well as thickening of the heart and associated blood vessels.  In the early stages of infection there may be no visible signs, however, infection may eventually lead to signs of heart failure (reluctance to exercise, lethargy, coughing) and even death. Heartworm is present throughout most of Australia (except Tasmania and arid areas).

Thankfully, heartworm is very easy to prevent and should form part of your pet health care routine. We have very effective preventative treatment options available including tablets, chews, spot-on's and even an annual injection for dogs administered by one of our vets. We recommend the annual injection for heartworm prevention as it the only heartworm prevention that is yearly & you don’t need to remember to give your dog a tablet!

Your dog can commence heartworm prevention as early as 12 weeks of age and if kept up to date will not require a heartworm test. The first injection is given at 12 weeks, then a booster at 6 months of age & then at 12 months of age. The prevention will then be up to date to be given every 12 months for the rest of its life. We can team up your pets vaccination & heartworm prevention so that it can be given the same time every year.

 If your pet has not been on heartworm prevention we strongly recommend a heartworm test prior to starting a prevention program, followed by a repeat test 6 months after commencing.

Please call us to discuss the best heartworm prevention for your pet.