The short answer for a guinea pig's floor
Unscented paper-based bedding is the safest all-round bedding for a guinea pig, with a properly fitted fleece liner over an absorbent layer as a close second. Guinea pigs spend nearly all day standing, walking, and sleeping directly on their bedding, and they have bare, delicate feet and airways that react badly to dust and strong scents. A good bedding for this animal therefore has to do three jobs at once: cushion the feet, absorb a surprising amount of urine, and stay almost dust-free when a pig burrows its nose in to forage.
Why aromatic shavings are a poor match here
Cedar shavings and strongly scented pine are the materials to leave on the shelf. Their aromatic oils can irritate a guinea pig's respiratory tract, and because guinea pigs live at bedding level with their noses close to the floor, they breathe whatever rises off that surface all day. Dusty recycled products cause a similar problem. Scented paper beddings are not a shortcut either, since the added fragrance sits in the same breathing zone. Also avoid clumping cat litter, which a guinea pig may nibble and which is not made to be eaten, and loose fluffy nesting material that can wrap around toes.
Choosing between paper bedding and fleece
Paper bedding suits owners who want a disposable layer they can spot-clean in minutes. Spread it generously across the whole floor, a little deeper in the corners and sleeping areas where guinea pigs settle most. It should feel springy rather than papery-thin, and it needs replacing in wet patches daily because guinea pigs urinate frequently and will otherwise stand in dampness.
Fleece works differently: urine passes through the fleece into an absorbent layer beneath, leaving the top surface drier underfoot. For fleece to work, the fabric must be washed and wicked before first use, cut to fit without loose folds a pig can burrow under and get trapped in, and paired with that absorbent underlayer rather than laid straight on the cage base. Many owners keep two sets so a clean, dry set goes in the moment the other comes out for washing. Poop sits on top of fleece, so a quick daily sweep with a small dustpan keeps it pleasant.
Protecting feet and skin day to day
Bedding choice is also foot care for a guinea pig. Hard, thin, or constantly wet flooring contributes to sore, swollen feet, sometimes called bumblefoot, and guinea pigs are heavy for their size, which adds pressure. Keep the sleeping and feeding zones dry, check that no wet patch is hiding under a hide house, and lift houses during spot-cleaning rather than cleaning around them. Feel your pig's feet during handling: redness, swelling, scabs, or a pig that shifts weight and resists walking needs a veterinarian's attention rather than just a bedding change. Likewise, repeated sneezing, wheezy breathing, crusty eyes, or loss of appetite after a bedding switch is a reason to remove that material and call a vet if breathing does not settle quickly.
A simple changeover routine
When you try a new bedding, change one thing at a time and watch for a few days. Note whether your guinea pig eats, drinks, and moves normally, whether the surface stays dry where they sleep, and whether anyone in the home notices dust when the bedding is disturbed. Whichever system you settle on, write it down where helpers can see it, because a well-meaning family member topping up with the wrong shavings undoes the choice. KinsLe's Family Sharing puts the exact bedding and cleaning routine on your guinea pig's shared profile, so every person who helps with the cage works from the same safe setup.