No offense, but this post really doesn't make any sense. If you rescued the rat from the pet store, he would be your's. If someone else rescued the rat, then it is their's. Why would the vet believe that he was your's if someone else brought him in???

Also, why would you take him to a vet that you didn't trust? And if you did trust them, then you would trust their judgement call on what meds. to take. Maybe you should take the rat to another vet if you aren't satisfied with the service that you are getting.

Just a thought.