Well I have been taking my pets to this clinic for years, I follow all the rules.. A few years ago I wanted to try 1800petmeds.. I was given prescriptions for there heart worm prevention medicine..Never a problem, now there are new vets, first they charged me a$5. prescription fee, now they tell me that the medication that I receive from 1800petmeds is obtained fraudulently ??? When I produced the package for verication, even though it was identical to theirs (merial limited) not out of date..Then I was told it was fraud, because this company does not sale to 1800petmeds..but if I purchased the same from them it would be good..please some one look into this claim