Just wait till the next scheduled feeding day and try again, unless he is in shed, then wait for him to finish. He should be hungry by that time. It is also a good idea to keep accurate records of feedings, refusals, prey size ,sheds, poops, weights, etc. Skipping a couple of meals is not uncommon, but if you notice a specic pattern to their refusals, then it may be time to adjust the prey size or adjust feeding days. Accurate records can also potentially help vets because trhey can get a look at the the history and patterns of the snake...