one of my cats has had loose stools for a while, so i'm taking him to the vet tomorrow. but as i have several cats (and many litterboxes) it's tough to get a stool sample I know if from him (have to catch him in the act). I was able to do this a couple of days ago so i have the sample (triple-bagged) in the refrigerator. will this be okay for the vet to test, or will it be too old (or too refrigerated)? I guess I don't know all what he will test for, does anyone know if there is an expiration date for poop