To use this Oxbow senior guinea pig food, simply put the appropriate amount in your guinea pig's food bowl every day. The amount can vary depending on your pet's size and activity level, but usually a small handful is enough for one meal. Make sure to always provide fresh water alongside the food. Keep the food in a cool, dry place to maintain its freshness. Check the package for the expiration date and don't feed your guinea pig any food that has passed it. If your guinea pig has any special health conditions, it's a good idea to consult your vet before starting a new food. This food is designed for senior guinea pigs over 4 years old, so don't feed it to younger guinea pigs without professional advice.