To use this Catit canned cat food topper, simply open a can and spread the tuna, shrimp, and pumpkin shreds in jelly over your cat's regular food. It's a great way to add extra flavor and nutrition. Keep in mind that this is a supplementary food, so don't use it as the only source of your cat's diet. Store unopened cans in a cool, dry place. Once opened, keep the can in the fridge and use the remaining food within a day or two. Make sure your cat has access to fresh water at all times when feeding this hydrating food.