Short answer: both oral and topical heartworm prevention offer similar protection, so the choice really comes down to your dog's temperament (swallowing a pill vs. a topical application) and your lifestyle. Most products follow a once-a-month dosing schedule.
Why is heartworm prevention so important?
Heartworm disease, transmitted through mosquito bites, can cause serious damage to the heart and pulmonary blood vessels if left untreated. Even indoor-only pets can be exposed to mosquitoes that get inside, so prevention is recommended regardless.
What's the difference between oral and topical medication?
Oral medication is convenient since it's given like a treat, but it can be tricky with dogs that refuse to swallow pills. Topical medication is applied to the skin at the back of the neck, making it a good alternative for dogs that are hard to medicate orally.
How often does prevention need to be given?
Most products follow a once-a-month schedule, though some come in longer-interval formulations (like quarterly). For the exact schedule, follow the product insert and your vet's guidance.
Do I need to give it year-round?
It depends on your region and climate, but as mosquito season tends to run longer these days, year-round prevention is increasingly recommended in many places. Check with your vet for the exact timeframe that applies to you.
What happens if I stop giving the prevention medication?
Even a gap of a month or two creates a window of infection risk. If you've missed a dose, check with your vet about how to safely resume and whether any testing is needed first.
