I wanted to re-post Dr. Siri Dayton’s truly excellent emails on the subject of heartworm that she wrote for the SFRAW Yahoo Group in 2009. I concur with her suggestions wholeheartedly. I have had dogs my entire life and have never once given any of them heartworm medication in any form; and I’ve never had a pet test positive. While San Francisco and the Bay Area are not areas with a lot of heartworm disease, whenever I visited heartworm endemic areas with my dogs (camping in the Sierra foothills or Russian River area, for example), I’d test them when I returned and then again 6 months later. The plan was if they tested positive at an early stage, we would then dose them with Ivermectin at that time only. I never had to do that because they were always negative. I would personally never use Heartguard as recommended conventionally. But I wouldn’t use Black Walnut preventatively either. However,
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