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Labs are not one of the breeds sensitive to invermectin. My boy is a Lab. I only treat for heartworm from May to Oct., as per my Vet. I am considering not doing even that in order to cut down on the chemicals going into his body. A few doggy friends have discontinued it. It's hard to know what to do when advice varies and preventatives might be as bad as the cure, completely contrary to the old saying.
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