Compare heartworm prevention prices
See what online pharmacies charge for your dog's heartworm prevention, side by side. Every price is shown per month, so different pack sizes compare fairly. Your vet will need a current negative heartworm test before prescribing.
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How we compare heartworm prices
We divide each offer's price by the months of protection it gives, then sort from cheapest to most expensive per month. A 6-dose pack and a 3-dose pack can then be compared like for like.
Match the weight band
Heartworm preventives are dosed by your dog's weight. Compare offers in the same weight range your vet prescribed.
Look at cost per month
Bigger packs often cost more up front but less per month. The monthly figure is the fairest comparison.
Check autoship
Some pharmacies discount repeat orders. We show the autoship price next to the full price when one is offered.
Common questions
Quick answers about comparing heartworm prevention prices.
Common questions
Quick answers about comparing heartworm prevention prices.
Do I need a prescription for heartworm prevention?
In the US, yes. Heartworm preventives require a prescription from your vet, and many vets ask for a recent heartworm test first. Pharmacies usually contact your vet to verify the prescription.
Does my pet's weight change the price?
Yes. Heartworm products are sold in weight bands, and prices can differ between bands. Compare offers in the weight range your vet prescribed, and ask your vet if your pet is near a boundary.
Do heartworm medications also protect against fleas?
Some do. Trifexis and Simparica Trio include flea control, while Heartgard Plus and Interceptor Plus focus on heartworm and intestinal worms. Check the label or ask your vet what each product covers.
Comparing other medications?
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