Dog Heartworm Prevention Calculator
Find the right heartworm prevention dose for your dog
Dog Weight (lbs)
Product Type
Dog Heartworm Prevention: Everything You Need to Know
Heartworm disease is spread by mosquitoes and can be fatal if untreated. Prevention is far safer, easier, and cheaper than treatment. Our dog heartworm prevention calculator matches your dog’s weight to the correct product size band for the three main prevention types.
Heartworm Prevention Comparison
| Type | Frequency | Also Covers |
|---|---|---|
| Heartgard Plus | Monthly | Roundworm, hookworm |
| Interceptor Plus | Monthly | Roundworm, hookworm, whipworm, tapeworm |
| ProHeart 12 | Yearly | Hookworm |
| Revolution Plus | Monthly | Fleas, ticks, ear mites, sarcoptic mange |
FAQs
Does my dog need year-round heartworm prevention?
Yes — the American Heartworm Society recommends year-round prevention for all dogs in the US. Even in cold climates, mosquito activity in late autumn and early spring can put dogs at risk. Year-round prevention also ensures continuous intestinal parasite coverage.
What happens if I miss a heartworm prevention dose?
Give the missed dose as soon as you remember, then resume the normal schedule. If your dog has been unprotected for more than 1-2 months, contact your vet — they may recommend a heartworm test before resuming prevention.
Conclusion
Our dog heartworm prevention calculator helps you choose the right product size at a glance. Always use under vet prescription with a current negative heartworm test. For complete dog health, use our age calculator and weight calculator.