I am a vet where heartworm "resistance" started. Have seen prevention failure for 8+ yrs now. Slowly spreading to other areas. I have seen failure w all preventatives. My personal preference is proheart - 6 mo shot. This is used commonly in my practice but has far fewer failures. Not scientific study just my personal clinical observation. As far as tx goes there is really only one tx that is approved. There is an alternative tx that is not approved that has increased risk to your pet. Yes companies will cover all/ partial/ none of tx costs depending on your purchase history. Online purchases don't qualify for coverage
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