I appreciate your service and prices, but need some help. Could you explain why the package of Heartgard Plus Merial Heartworm Pills I ordered from you came from Singapore when the package reads made in USA? I called Merial Corporation who said I should only trust pills from my vet. and they could not help to verify that these pills were actually made by Merial. Thanks for your prompt answer. I`d like to remain a customer but do need an answer to reassure these are safe for my dogs.