Join Date: Jun 2009
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Yes, I do stop in the winter, and yes I ALWAYS have him tested before starting up again in the spring. Remember that heart worm meds work to kill the critters AFTER, not to actually "prevent" them. So you start approximately one month after the first possible chance of exposure. Late May/Early June is the earliest that would EVER be needed around here, and that is being VERY conservative. The end of June would probably be fine most years. I suspect you are probably a LITTLE warmer than we are, but I suspect that late May would work fine for you too. Dave posted a nice chart of the possible infection dates by region at one point… Maybe you can get him to post it again. Then remember that you need to give the last dose at least a month AFTER the last possible date of infection. I our area, that usually means a late Nov./early Dec. dose.
The reason it's important to test if you are going to take them off for part of the year is that if they DO, manage to get themselves infected (and it CAN happen, even to dogs who are on preventative year-round) and you give them Heart worm meds when they have a high population of heart worms in their system, the die-off of the worms, themselves can cause damage to the heart and lungs. So dogs with an active infection have to be carefully managed during treatment.
Karen, Kodi, Pixel and Panda
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