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Originally Posted by Ellie May  Another good reason not to use Revolution is that there are soooo many reports of it being ineffective for heartworms. In my opinion, the stuff does not work well enough and I would never trust Ellie's heartworm health with this product... |
My vet told me this, too. It's because Revolution is topical. And there's always the likelihood that a topical will wash off. You can't ever question whether your dog is getting heartworm medication if it's oral.