Are you feeding live or PK. If live try Pk. What size rat are you trying to feed? Are you feeding on a schedule i.e every Friday at 6.00 pm? If your not on a schedule migh want to get on one it really helps in long run. There are lots of little tricks you can try to convert them over but as muddoc said some never convert over. Try senting the rat with soiled mouse bedding, By rubbing the rat all over the bedding. If that doesn't work try placing the rat (PK or FT only) in a bag with the snake and leave it for a few hours. Still not eating? you can try braining if you have the stomach. Again braining only with Pk or Ft. Take a knife or something sharp and break open the brain case get the head alittle bloody and then try the the bag trick or just leaving it in the cage.