I just ordered a year's supply of Interceptor online from Pet Care Rx for a pretty good discounted price and apparently my vet won't fill a prescription for any online pet meds because they can't be sure of where the medication is coming from. The receptionist said bad things have happened but wasn't specific. Has anyone heard of this-- or is my vet just trying to get me to pay full price? I would think a big company has a reputation for selling quality items and if the medication is a brand name-- why would this be a problem?