Ask your veterinarian if he or she thinks cat Greenies treats are appropriate for your cat. Then administer cat Greenies, and all treats, sparingly. Treats not meant to be nutritional supplements or to replace meals. Treats are designed to be a tasty snack for your kitty to enjoy from time to time and cat Greenies are no different.
There is nothing wrong with a snack now and then, but too many snacks can make your cat ill or cause nutritional problems. And always monitor your cat while she's eating a Greenies treat. Even under the best conditions, accidents, like choking, can occur. However, there's no reason to be paranoid. Everyone deserves a little treat now and then and so try out a bag of cat Greenies.