Her haeartworm test came back positive. In all the years (since 1981), I have never had a dog test positive. She will be re-checked in two weeks to see of this was a fluke (praying for that). I have already contacted Merial (they have changed their name), the maker of Heartgard. I have a case number and receipts from the last two years of purchase. I am ready to go. If she has to have treatment, it won't be easy on her or us. She is very active and loves to run. We do have a smaller area of the yard fenced where she can go out, but I may still have to walk her to make sure she isn't too active. Merial, or whatever, will pay for the treatment which is quite expensive. I just don't want her to be positive.