Commercial treats are available, but these are often high sugar and not great for your guinea pig in the long term. Instead, try offering small cubes of fresh succulent goodies such as a corn kernel, apple, cucumber, melon, strawberry, dandelion, peas, broccoli, cauliflower, or carrot tops. Give just a taste, as you don't want the guinea pig to spend ages chewing or fill himself up with the first treat!