I downloaded an App that someone posted on the fb page called Carb Calc. Does anyone use it? It asks for ash % but most of the things I'm seeing don't have that listed. I've put in a few foods and I get this message with varying negative numbers depending on the food. I thought if this worked well I could have my husband download it and use it at the store when he's picking up cat food after work while we figure out what she will eat. The Petsmart is a block away from him so it's convenient.