Using Fruitables Switch is easy. Simply mix it with your pet's food as directed. Start with a small amount and gradually increase it over time to help your pet adjust to the new diet smoothly. Make sure to keep an eye on your pet's reaction during the transition period. As for storage, after opening, put Switch in the refrigerator. It'll stay good for up to 7 days. This supplement is suitable for both dogs and cats, but if your pet has any special health conditions, it's always a good idea to consult your vet before using it. And remember, this product is made in the USA and was developed by vets, so you can trust its quality.