You know, just a check up that looks for anything out of the ordinary? Blood tests and such? I called my vet and they said if one dies I can take it to the university to see what it died from. I feel like there should be something to do before it gets to that point. I am asking because a few years ago we lost a bunch of chickens to a mystery disease. My husband now thinks that any chicken we get will end up with the same illness. None of my chickens have any signs of illness. They are currently living in the same barn the othr chickens were in though.