To use these Feline Greenies Smartbites, you can simply give them to your cat as a regular treat. You can also place a few inside a treat dispenser toy to make playtime more fun. As for the quantity, since each treat has less than 2 calories, you can give your cat a reasonable number according to its daily calorie needs. Just keep an eye on how much your cat eats to maintain a healthy weight. Store these treats in a cool, dry place to keep them fresh. If you notice any changes in your cat's health after giving these treats, stop using them and consult your vet.