Hamster bedding should be at least 8 to 10 inches (20 to 25 cm) deep so your hamster can burrow, which is one of its strongest natural behaviors. Use a safe, unscented paper-based bedding or aspen. Never use cedar or pine shavings, which can harm the lungs, or cotton wool, which can cause blockages.
Bedding is not just something to soak up mess. For a hamster, deep bedding is the difference between a stressed pet that bites the bars and a content one that tunnels, nests, and behaves naturally. This guide covers how deep bedding should be, which types are safe, and how to layer it well.
How deep should hamster bedding be?
Aim for a minimum of 8 to 10 inches (20 to 25 cm), and deeper for Syrians, who dig more extensively. This depth lets a hamster build real tunnels that hold their shape, which is exactly what they do in the wild. Research and welfare experts link deep bedding to a clear reduction in stress behaviors like bar biting. If your enclosure cannot hold this much bedding because the sides are too low, that is a sign the enclosure itself needs to change.
Why burrowing matters: digging and tunneling are core hamster behaviors, not optional enrichment. A hamster that cannot burrow is missing something fundamental, which often shows up as repetitive cage-bar biting or frantic corner digging.
Safe bedding types
Stick to materials that are absorbent, low-dust, and free of harmful oils.
| Safe bedding | Notes |
|---|---|
| Unscented paper-based bedding | Soft, absorbent, holds tunnels reasonably well. A reliable all-round choice. |
| Aspen shavings | A safe wood bedding that holds burrows well. Choose low-dust. |
| Hemp bedding | Good for structure, often mixed with paper for softness. |
| Soft wood-free mixes | Many keepers blend paper and hemp or aspen for the best of both. |
Bedding to avoid
Some common products are genuinely unsafe.
| Avoid | Why |
|---|---|
| Cedar and pine shavings | Release aromatic oils that can damage a hamster’s sensitive respiratory system. |
| Cotton wool and fluffy nesting | Can cause intestinal blockages if eaten and tangle around limbs. |
| Scented or dyed bedding | Added fragrance and dust can irritate the airways. |
| Sawdust or very dusty bedding | Fine dust causes respiratory problems. |
| Corn cob | Poor absorbency and can grow mold when damp. |
How to layer bedding for good tunnels
A little technique makes burrows hold up.
- Mix bedding types. A blend of soft paper and structured aspen or hemp lets tunnels keep their shape without collapsing.
- Lightly press or dampen one area. Slightly firmer bedding in a section helps tunnels stay open, though most of the bedding should stay dry and loose.
- Fill to depth across the whole floor, not just one corner, so your hamster can dig wherever it likes.
- Add nesting material on top: plain, unscented toilet paper or paper towel for a cozy nest.
How often to change bedding
Less often than you might think. Spot-clean the potty corner and any wet spots daily, but avoid full bedding changes more than every few weeks, because a complete reset removes your hamster’s reassuring scent and causes stress. When you do a deep clean, keep a handful of clean old bedding to mix back in. See our cage cleaning guide.
How much bedding do you actually need?
Deep bedding uses more substrate than new owners expect, and that surprises people at the checkout. To fill a 40 by 20 inch floor to a depth of 8 to 10 inches, you will need a large volume of bedding, often several big bags or compressed bricks at a time. Buying bedding in bulk, such as large compressed paper or hemp bricks that expand, is usually far cheaper per liter than small pet-shop bags. Because you only do full bedding changes every few weeks, a bulk supply lasts a long time and keeps the ongoing cost low.
Spot-bedding for burrows that hold
If your hamster digs tunnels that keep collapsing, the bedding mix is usually the reason. Very soft, fluffy paper alone does not hold a tunnel, while structured materials like hemp and aspen give walls that stay put. The trick most keepers use is to combine the two, with a firmer base layer for structure and a softer top layer for comfort and nesting. Lightly misting one section of the deeper bedding can also help the burrows keep their shape, as long as most of the substrate stays dry.
Frequently asked questions
Is 6 inches of bedding enough for a hamster?
It is below the recommended minimum. Aim for at least 8 to 10 inches so your hamster can build proper tunnels. Six inches is better than a thin layer but still limits natural burrowing.
What is the safest hamster bedding?
Unscented paper-based bedding and low-dust aspen are both safe, popular choices. Many owners mix them for softness and tunnel structure.
Can I use toilet paper as bedding?
Use plain, unscented toilet paper as nesting material on top of the bedding, not as the main substrate. It makes a great nest but is not absorbent enough to replace proper bedding.
Can I use fleece liners instead of deep bedding?
No, not as a replacement. Fleece covers the floor but removes the ability to burrow, which is a core hamster need. Some owners add a small fleece area as an extra, but the main enclosure should always have deep, diggable bedding.
How do I stop bedding going everywhere outside the cage?
Some scatter is normal as hamsters dig. A taller enclosure or a tank with higher sides keeps most bedding in, and a raised base or bedding guard reduces overspill. A washable mat under the cage catches the rest.
The bottom line
Give your hamster at least 8 to 10 inches of safe, unscented paper-based bedding or aspen so it can burrow naturally, and steer well clear of cedar, pine, and cotton wool. Layer a mix of soft and structured bedding for tunnels that hold, and avoid over-cleaning. For the full habitat picture, see our cage setup guide.
Keep reading: Cage Setup Guide, Cage Size, Hideouts & Nesting.
Note: every hamster is an individual, and needs vary a little by species. When in doubt about your hamster’s comfort or health, an exotic vet can advise.
