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Which bedding is safe?

The wrong bedding is one of the quietest causes of illness in small pets — pine and cedar harm the airways and liver, and “cosy” fluffy bedding can block a gut or trap a limb. Here’s the fact-checked safe / caution / unsafe list, plus the right substrate for your species.

The materials, rated

General rules for small mammals. Your species may have extra specifics — check below.

✅ Safe

⚠️ Use with caution

  • Corn cobAbsorbs poorly and can grow mould if it gets damp, and may cause a blockage if eaten — usable only if kept scrupulously dry, though better beddings exist.AFRMA — The Bedding Dilemma
  • Sawdust & very fine dusty shavingsFine dust irritates delicate airways and eyes — avoid sawdust and any bedding that clouds when you pour it. If you use shavings, use a dust-extracted grade.RSPCA — Creating a good home for rats

🚫 Unsafe — never use

  • Pine & cedar (untreated) shavingsUntreated softwood gives off aromatic phenols and acids that irritate and damage the airways and liver; cedar is the worst — one study found most rat pups raised on cedar died within two weeks, versus almost none on aspen or corn cob.The Rat Fan Club — The Toxicity of Pine and Cedar Shavings
  • Cotton-wool & fluffy 'fibre' strand beddingCan be swallowed and block the gut, or wrap around a limb or tail and cut off the circulation — a common cause of lost feet. Never use it, however "cosy" it looks on the shelf.RSPCA — Creating a good home for hamsters
  • Clumping / clay cat litterThe dust harms airways and, if eaten, clumping litter can swell and block the gut — never use it as bedding or litter for small pets or ferrets. Use paper-based, non-clumping, non-expanding litter instead.RSPCA — Creating a good home for rabbits
  • Scented / dyed beddingPerfumes and dyes add nothing but respiratory irritants — small pets have far more sensitive airways than we do. Choose plain, unscented, undyed bedding.RSPCA — Creating a good home for rats

The right bedding for your pet

Whatever bedding you choose, use a dust-extracted grade that’s unscented and undyed — and never let it get damp. When authorities differ (for example, some welfare bodies prefer paper over aspen for rats), we’ve noted it rather than pick a side.

Common questions

Why are pine and cedar shavings bad for small pets?

Untreated pine and cedar shavings give off aromatic phenols and acids that constantly irritate and can damage the delicate airways and liver of small animals. Cedar is the most harmful — in one study most rat pups raised on cedar died within two weeks, compared with almost none on aspen or corn cob. Kiln-dried, dust-extracted (heat-treated) pine has had most of those phenols driven off and is considered safe; raw pine and any cedar are not.

What is the safest bedding for small pets?

Plain paper-based bedding (shredded paper, paper pulp or dust-extracted paper products) is the safest all-round choice — absorbent, low-dust and harmless if nibbled. Aspen (a non-toxic hardwood) and kiln-dried, dust-extracted pine are also fine. For rabbits and guinea pigs, dust-free hay and straw double as safe-to-eat bedding. Whatever you pick, choose a dust-extracted grade, unscented and undyed.

Why can’t I use cotton-wool or fluffy “fibre” bedding?

It’s sold as cosy nesting, but it’s genuinely dangerous: small pets can swallow the strands and suffer a fatal gut blockage, or get a limb or tail wrapped in the fibres tightly enough to cut off the blood supply and lose the foot. It also doesn’t absorb. Use shredded plain paper or plain tissue for nesting instead.

Is clumping cat litter safe for small pets or ferrets?

No. Clumping and clay cat litters produce dust that harms sensitive airways, and if a small pet eats the litter it can swell and cause a gut blockage. Use a paper-based, non-clumping, non-expanding litter instead — for rabbits, ferrets and any small pet.

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