These plastic lids amuse me. As you might surmise, they are for re-sealing opened dog and cat food cans. I found them in the pet food aisle at the grocery store. I don’t have a dog or a cat and as I am not yet reduced to consuming pet food, I don’t use the lids for their intended purpose. The cat lid is a perfect fit for a standard tuna can and the dog lid is a match for a 15 ounce can of pumpkin (which I use often in baking). But what really sold me was the words gimme food which so perfectly sums up my personal philosophy.