Best bedding for pet mice: what is safe and what to avoid

What is the best bedding for mice?

Paper or card-based bedding is the best for most mice. The PDSA recommends a deep layer of pet-safe, dust-free bedding and names paper or card types as a good choice, and the MSD Veterinary Manual calls paper-based bedding the best choice. It soaks up urine, holds a tunnel when mice dig, and has no aromatic oils.

Mice live with their noses in their bedding all day, so dust and strong smells matter more than they would for a bigger animal. Breathing problems are among the most common illnesses in pet mice, and Wood Green lists dusty bedding as one of the risk factors. Pick a bedding that does not puff up dust when you pour it.

Mouse bedding types compared

Is aspen bedding safe for mice?

This is the one point where good sources disagree. Wood Green lists aspen alongside shredded card, hemp and paper as a suitable substrate. The RSPCA lists aspen with sawdust and wood shavings as something to avoid for mice, and the MSD manual says wood shavings in general are less ideal than paper.

Aspen does not carry the strong aromatic oils of pine or cedar, which is why many keepers like it. But it is still a wood shaving, and the RSPCA is the stricter voice. We'd use paper or card as the main bedding. If you want the look and feel of aspen, mix in a little dust-free, kiln-dried aspen rather than using it on its own, and watch for sneezing.

Is pine bedding safe for mice?

No, we'd avoid pine, and never use cedar. PetMD says the aromatic oils in cedar and pine shavings irritate a mouse's skin and airways, and the MSD manual calls both irritating. Some keepers use kiln-dried pine, but paper bedding does everything pine does without the doubt, so there is no reason to use it.

Is paper bedding good for mice?

Yes, it is the best. Paper bedding comes as soft loose fluff or small pellets. Loose paper holds burrows well and feels soft for nesting. Pellets are heavier, spill less and can be easier to spot clean. Many owners use a layer of each. Choose an unscented, dust-free type, and avoid any with added colour.

Is corn cob bedding OK for mice?

We'd skip it. None of the UK charities or vet sources we read list corn cob as a mouse bedding. It is hard underfoot, it cannot be shaped into a nest or tunnel, and once wet in a toilet corner it can go spoiled. That is our reasoning from what the sources ask for (soft, absorbent, diggable bedding), not a published warning, but it is enough to choose paper instead.

What is the best bedding for mice smell?

An absorbent paper or card bedding, deep enough that urine soaks down, plus a daily spot clean of the toilet corner. The smell in a mouse cage comes from damp, soiled patches and from male mice marking with urine. RSPCA Australia notes that ammonia builds up when a cage is poorly aired or not cleaned often enough.

• Use absorbent paper, card or hemp bedding
• Give the mice a toilet box or corner, and clean it every day
• Choose a barred cage with good airflow rather than a closed tank
• Remove leftover fresh food daily before it goes off
• Do a full clean every one to two weeks, as the RSPCA advises
• Never use scented bedding, air fresheners or sprays near the cage

What nesting material is best for mice?

Plain white tissue, shredded paper or hay. Wood Green recommends soft white tissue such as tea-bag style nesting, and the RSPCA lists hay, shredded paper, paper strips and tissues, and suggests offering a mix. Put a handful next to the hides and let the mice build their own nest. They will carry it where they want it.

Never give cotton wool or fluffy "safe" nesting. The RSPCA says these break into thin strands that can tangle round legs and tails tightly enough that a vet has to amputate or put the mouse to sleep. The PDSA adds they are dangerous if swallowed.

How deep should mouse bedding be?

At least 2 cm (¾ in), the RSPCA's minimum, and PetMD suggests 2.5 to 5 cm (1 to 2 in). Mice burrow, so give a deeper pile in one corner. The RSPCA says bedding should be deep enough for mice to burrow into the dark, but shallow enough that you can still check on them. A deep-based cage, covered in our mouse cage size guide, makes this much easier.

Mouse bedding alternatives and homemade bedding

You can make good bedding at home from plain paper and card. The RSPCA lists shredded filter paper, and Wood Green lists shredded card.

1. Collect plain paper and card. Use unbleached or white paper, plain cardboard boxes and egg boxes. Skip glossy, coloured, inked or scented paper.
2. Shred it. Tear or shred into strips. A paper shredder on strip-cut works well.
3. Remove tape and staples. Pull out anything that is not paper.
4. Mix for absorbency. Homemade shreds soak through faster than shop paper bedding, so layer them over a base of paper bedding or hemp, or spot clean more often.
5. Keep it dry. Store spare bedding in a dry, sealed tub so it cannot pick up damp growth.

RSPCA Australia also mentions newspaper or towelling as a floor covering under bedding. We'd keep newspaper to the very bottom layer only, because the ink can rub off on pale coats.

How often should you change mouse bedding?

Spot clean soiled bedding every day and change it all every one to two weeks. The RSPCA and Wood Green both give this pattern. The MSD manual is stricter, at least twice a week for bedding, and the PDSA says a full clean weekly. We follow the RSPCA, because mice rely on scent to know their home and group, and changing everything too often can start squabbles. Keep a handful of clean, dry old nesting and put it back after each change.

For the rest of the cage, see our mouse cage setup guide, and for everything else your mice need, our pet mouse care guide. If a mouse starts sneezing or clicking when it breathes, see pet mouse health and change to a less dusty bedding.