I ordered flea tick heartworm... trio. Received authentic meds in original sealed package. We have 6 foster fails and 5 rescues. Yikes. Last rescue was a puppy in such bad shape vet wasn't sure he'd pull through. Flea and tick infested and too weak to get treated. Of course, within a week the rest of the gang were also infested. I decided to give Pet Bucket a try. Live on an island in the Caribbean. Online shopping can be a problem. Worried, I contacted Pet Bucket. I didn't ask to track the shipment :-( But Pet Bucket checked. Told me the package was at my post office. We checked. It was. Gave all 11 with no bad reactions. They loved the chews. I love Pet Bucket.