To use these Vitakraft treat sticks for your guinea pig, simply attach the stick to their cage using the included clip holder. This makes it easy for your pet to reach and enjoy. As for how often, give your guinea pig one stick at a time, and you can offer a new stick every few days. Remember, these are treats, so they should be part of a balanced diet. Keep an eye on your guinea pig while they're chewing to make sure they're not having any issues. Store the remaining sticks in a cool, dry place to keep them fresh. Avoid exposing them to moisture, as this can make the sticks lose their crunch and may cause spoilage. And always make sure your guinea pig has access to fresh water while enjoying these treats.