re: For those of you who have your dogs on heartworm | flea preventive medicine

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My vet told me that the drug companies only guarantee the drug when sold by a vet,

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Your vet is a good sales person.

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I've also heard stories that those companies sell expired drugs or give "replacement" drugs

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The only thing that is different is the dog on the front of packaging and weight specifications. The two sites that I listed are very reputable for an overseas operation and do not sell expired medications.