Wagg Twitch Dry Treats Guinea Pig Feed is designed to be fed alongside a diet that is up to 85% hay or fresh grass. It contains extra vitamin C, essential to keep your guinea pig healthy. It also contains yeast extracts including prebiotic MOS to keep your guinea pig's digestive system healthy and promote healthy gut flora. High-quality ingredients are combined into a single nugget formula to avoid selective feeding and promote a balanced diet.