Our vet suggests a test every year, but since mine are on it all year long, we only do it every couple years. Star's first vet, in Illinois, was very insistent on using heartworm prevention meds. He had this gross model of an infested heart that he kept in his office --- after seeing that, I don't want to risk my babies getting it!
Sue - don't know if you found the heartworm map yet, but there's a US tick infestation map out there too. Wish I had bookmarked it![]()
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