I too have been using the Seresto collar and have been happy with the results and I change them out every six months like Harold. If you buy online be careful as there are counterfeits on the market, if the price is super low probably is a counterfeit. Check the Bayer website for more info.
I just went on line the collar sells $57 or two for $105 at retailers I trust, ie Walmart, Chewy, Petsmart etc., I saw others advertised between $18 and $30 these are the counterfeits (from China) if you look at the labels you can see the difference, wrong dog on the label, much wider white margin on another, so I guess it is wise to buy from a retailer that you know.
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