The vet has told me to keep my cat caged until he has surgery tomorrow. He's sorted out with a cage which is big enough to have his bed, food and water and a litter tray far enough from his food to be ok. The only problem is I can't get him to use the litter tray. I know he hasn't 'been' since yesterday morning, but has been eating and drinking as normal. Will he give in and eventually use the tray, or is there anything I can do to encourage him? Thanks.