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Welcome to Justanswer! I am Dr. Altman and happy to assist you both todayAlthough these two products work differently to prevent heartworm disease I would err on the safe side and wash off the revolution as a precaution with dawn soap applied to the area for ten minutes then rinse.Again this would just be a precaution but with his little size I would ensure that he doesn't have a reaction from being on both at the same time. I suspect he would be just fine regardless but if he were my little guy I would wash it off and use a different flea and tick medication in a few weeks such as frontline plus or advantix IIPlease let me know if you have any additional questions or if I can assist in any other way
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