I often feed my girls their meat frozen, as a) they like some of it better frozen (organs, fish especially), and b) our fridge is usually pretty full and I shamefully sleep in too much so they want to be fed right away! I've heard some people say feeding frozen is BAD and some say it's no biggie. What I haven't heard is WHY for either. Keep in mind we don't feed beef, at least not yet, as one has a bad allergy, so it's not large pieces - mostly chicken and pork. I do run hot water over it first to soften it up a bit. They seem to have no trouble eating it!