Took our two mixed breed dogs, one male and one female, to the vet today for the annual checkup and pick up heart worm and flea and tick prescription medication, about $500 worth for a year's supply. A couple of days later after we got back home we going to start giving it to them, when we were getting it out of the box and started to open it we noticed that it was out of date (Credelio) and that the date on the box was blacked out a a new date written in. We were really concerned about it and went back to the vets office for an explanation, and were also concerned about the fact it could cause seizures with its use. We were told they do not give us a refund as it is not their policy, can anyone tell me if this is every vets policy? We are located in Pensacola Florida, are retired and have been using this veterinarian for years.