To feed your adult cat aged 1 - 6, simply open the 5.5 oz can of Hill's Science Diet Tender Tuna Dinner and serve it to your feline friend. You can leave the food out for a few hours, but make sure to remove any uneaten portion after that to keep it fresh. Remember, this food is not for kittens or pregnant/nursing cats. If your cat is in these special conditions, switch to the appropriate Hill's Science Diet kitten food. Store the unopened cans in a cool, dry place. Once opened, if there's any food left, cover it and refrigerate, then use it within a day or two.