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  1. Adverse Side Effects NOT listed Seresto by Bayer

    General Dog Forum
    WARNING - Adverse Side Effects NOT listed: “Seresto” anti-flea and tick collars that contain a nicotine chemical (imidacloprid) that can cause seizures, thyroid gland damage, mutations, abortions and birth defects, (and is a class of widely used agricultural chemicals implicated in the...
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