Suitable bedding materials for Guinea pigs include paper-based products, aspen shavings, and fleece liners designed for small animal cages. These options provide a soft, absorbent, safe layer for their delicate feet and respiratory systems. Avoiding cedar and pine shavings is crucial, as the aromatic oils in these woods can cause respiratory and liver issues in Guinea pigs. Additionally, bedding should be several inches deep to allow for burrowing and must be changed regularly to maintain a clean, healthy environment for these sensitive animals.