Gerbil Substrate & Bedding | Safe and Suitable Materials

You’ve got your gerbil cage – if not certainly read our guide about choosing a gerbil cage – and now you need to get substrate to give your gerbils a soft surface to run on and make tunnels. You’ll also need bedding material to use as nesting material. There are a lot of different substrates and bedding out there and a lot of misconceptions about what kinds are suitable for gerbils.

The best substrate (also called bedding) for gerbils is a plant-based substrate that is absorbent, controls odors, is non-toxic, and is good for creating tunnels. It’s best to combine different substrates such as aspen wood shavings, a paper-based substrate, and hay.

There are a lot of different types of substrates available online and in pet stores. Some of them are not suitable for gerbils and can even be a hazard for them. So you need to know to separate the good and the bad types of substrate. The same goes for the bedding.

In this article, you’ll learn exactly that. You’ll learn how to pick the right kind of substrate and bedding for your gerbil cage. At the end of this article, you’ll know what types of substrate and bedding are suitable for your gerbils and which to absolutely avoid.

What’s the Difference Between Substrate and Bedding?

An empty cage needs to be lined up with soft material to make it suitable for your gerbil. The material that’s used for lining up the cage floor is called substrate but is sometimes mistakenly called the bedding. But there is a difference between these two terms, although it’s kind of a small difference.

What’s the use of substrate?

  • keep the cage clean and hygienic
  • create a soft walking area for your gerbils
  • is used to let your gerbils burrow and create tunnels
  • sometimes is also used as nesting material

What’s the use of bedding?

  • is used as nesting material

Gerbil Cage Substrate

What’s important when choosing a substrate?

General guidelines

When you look around for cage substrate you’ll need to make sure that it’s safe to use and suitable for your gerbils. Don’t pick just any kind of substrate you view online or in a pet store. 

And always consider the following important factors:

  • toxicity: it’s obvious that you don’t want your gerbils to die. But it’s not always easy to know if the substrate is (potentially) toxic or can cause problems for your gerbils’ health. Gerbils will chew on their substrate and can sometimes ingest parts of it. So, avoid substrate that’s possibly harmful to your gerbils;
  • odor-control: the substrate needs to control possible odors that form in the gerbil cage. However, avoid scented products since gerbils have very sensitive noses.
  • hypoallergenic properties: a lot of people suffer from allergies but these allergies aren’t necessarily to be attributed to your pet. Substrate can contain a lot of dust that can become airborne and harm you and your gerbils. So, you want to choose a substrate that contains the least dust as possible;
  • absorbent properties: you want your cage substrate to be absorbent so it can absorb the urine of your gerbils and the cage remains hygienic.

Specific gerbil needs

Gerbils build tunnels and burrows in the wild and need to be able to do the same in captivity. Some rodents don’t need thick layers of substrate and aren’t real tunnel builders but gerbils are. So if you only give a thin layer of a substrate or if the substrate isn’t suitable for tunneling your gerbils won’t be happy and can get stressed.

When you choose a substrate make sure that it’s suitable for digging and making tunnels.

Extra tips

Besides the important factors I mentioned above, you’ll probably consider a few other less important factors. These factors can have an influence on what kind of substrate you get:

  • easy to clean: some substrate can clog and become hard when it comes in contact with urine or water. If this is the case you’ll have more work cleaning up the large and swollen substrate from the cage;
  • weight of the material: there are lightweight and heavyweight substrate types. If the material is lightweight it can be kicked out of the cage by your gerbils (which love to dig and mess around) and end up messing up your home. For gerbils it’s advised to use a gerbilarium so the substrate can’t mess up your home;
  • budget: there are expensive kinds of cage substrates around but even within a certain type of substrate you can find large price differences. The cheaper substrate, however, is usually of less quality.

What kinds of cage substrate are there?

When you take a look at the substrate online or in pet stores you’ll probably be unsure what type of substrate to get. Let’s take a look at the kinds of cage substrate there are available for rodents and gerbils.

Wood shavings

Wood shavings are a popular substrate for a lot of animals, including rodents. It’s also possibly the oldest form of substrate for animals. Shavings are a waste product from lumber production and usually have a curly look. Wood shavings can come from different kinds of trees but most commercial wood shavings will come from pines, cedars or aspen trees.

Paper-based substrate

More recent, commercial substrate is based on (recycled) paper. These paper-based substrates come in all kinds of shapes, sizes and even colors. There are some concerns with recycled paper. They can still contain ink residues, although most paper-based substrate is safe enough to use.

Wood pulp substrate

Wood pulp substrate is related to a paper-based substrate and it’s not always as easy to make the difference between these two substrates. They have roughly the same properties and are more expensive substrate types. Wood pulp substrate is made of natural wood fibers.


Hay and straw are sometimes confused with each other. Hay is the product of cutting a plant before the plant starts producing seeds. The result is a high-quality fiber. Hay has a high nutritional value and is used as feeding material. Gerbils naturally don’t really eat a lot of hay but can use it to file their teeth down.

Straw, on the other hand, is the stalk of the plant after the seeds have been harvested. It’s a byproduct of harvest and has little nutritional value. The value of straw lies in its use as substrate and bedding material. It’s an excellent material because it doesn’t develop mold as quickly and has a low cost.


Wood and paper pellets are made from trees or recycled paper. They look like tiny tubes or even food. Pellets are often used as a substrate for rodents and other small pets.

Corn cob

A less common substrate for gerbils is corn cob. It’s more known as a substrate for bird cages. Corn cob is made from the dried granulated cob from corn. It’s in fact the central core of an ear of corn. Corn cob substrate looks like small almost round particles.


Hemp bedding is made from the inner core of the hemp stalk. This core is made from fibers that have a high absorbency and also are good at reducing odors. It’s a biodegradable and compostable type of bedding that’s safe to chew and may be ingested by your gerbils. 


Mongolian gerbils live in a sandy environment and sand as a substrate would create a more natural-looking environment for them in captivity. Sand is sometimes used as a substrate as long as it’s sterile but is also used as a bath for gerbils just like chinchillas use a sand or dust bath.

Cat litter

When you think of cat litter you probably won’t think to use it as a substrate for gerbils. But cat litter is a possible substrate you can find in stores and online. Cat litter is typically made of granulated clay or bentonite, a special kind of clay, and is known for its absorbent properties and odor-control. 

Safe substrate types for gerbil cages

Important notice: online stores and pet stores often use the term “cage bedding” or just “bedding” to indicate substrate. Below I’ll go through suitable substrates for gerbils. Later on, I’ll get into the real bedding material.

The following substrate types are safe (non-toxic) to use for gerbils:

  • aspen wood shavings
  • paper-based substrate
  • corn cob substrate
  • hemp substrate

But not all of these substrate types are suitable for tunneling and some are more expensive than others. Below you’ll find a short description of each safe substrate type and the pros and cons for each one.

Aspen wood shavings

Wood shavings are usually not that suitable as a substrate for your gerbils because they contain phenols which can be dangerous for small animals. Aspen shavings are generally considered to be safer than pine and cedar shavings. These shavings are made from hardwood and are almost dust-free and are non-aromatic.

  • absorbent
  • odor-control
  • cheap
  • can cause allergies

Aspen shavings can be chewed and are non-toxic natural materials. Gerbils will chew on the shavings. The resulting wood pulp can be used to build tunnels. However, on its own, the shavings aren’t great for tunneling. You can help your gerbils by putting in toilet rolls as fixed tunnels or mixing it up with other kinds of substrate to make sturdy tunnels.

Paper-based substrate

Most paper-based substrates will have a higher absorbency than wood shavings (usually 2 times better) and they contain far less dust than shavings.

The downside is that they’re a bit more expensive than aspen wood shavings. However, most gerbil owners will use paper-based substrate from recycled paper or even from new (never-used) paper.

  • highly absorbent
  • odor-control
  • (almost) dust-free
  • expensive

Corn Cob substrate

Corn Cob bedding is usually marketed for birds but is also recommended as a substrate for small rodents, like gerbils. It’s known for its high absorbency and odor-control but is also the more expensive kind of substrate. It also isn’t suitable for making good tunnels or nests because corn cob can’t be shredded in tiny pieces like other materials.

  • highly absorbent
  • odor-control
  • low amounts of dust
  • expensive
  • possible mold growth
  • not suitable for tunnels
  • can be painful for feet

Hemp substrate

Hemp substrate is a fairly unknown type of substrate for gerbils but is gaining popularity in certain regions. It’s possible that it’s very difficult to find in your region or even unavailable.

Hemp is a fairly expensive substrate but has all advantages of paper-based substrate and is a popular alternative for wood shavings because of it’s low amounts of dust.

  • highly absorbent
  • odor-control
  • (almost) dust-free
  • expensive

Substrates to absolutely avoid

A lot of available substrates aren’t suitable for gerbils and should be avoided at all costs. Never use any of the following substrates for your gerbils:

  • sawdust
  • wooden or paper pellets
  • pinewood and cedarwood shavings
  • cat litter
  • sand


Sawdust is a soft and lightweight substrate that’s definitely not suitable for gerbils and other small pocket pets. This substrate contains a lot of tiny dust particles that become airborne very fast. The tiny particles will end up in your gerbils’ lungs and will usually lead to respiratory problems.

Wooden or paper pellets

Wooden or paper pellets are relatively small but are highly absorbent. Gerbils will chew on their substrate and can ingest parts of it. If your gerbils ingest pellets they will swell inside their body and this can cause an obstruction of the intestinal tract. Pellets are also hard and can, just like a wire mesh floor, cause injuries to the feet of your little critters.

Pinewood and cedarwood shavings

Wood shavings from pine and cedar trees contain the following substances:

  • naturally occurring phenols
  • abietic (pines) or plicatic acid (cedars)

Phenols can be toxic and cause acid burns in high quantities. The phenols have a low molecular weight which makes them become airborne very easily. When they’re airborne they can be inhaled by your gerbils. This might lead to your gerbil dying in a matter of hours depending on the concentration of phenols in the shavings.

Pine trees are a species of conifer trees and contain abietic acid while cedar trees contain a unique kind of acid called plicatic acid. Both acids are the cause of skin and respiratory irritations. Plicatic acid can also worsen asthma and cause allergic reactions.

Kiln drying is a process where excess water is removed from the wood. Kiln drying is used to among other things remove phenols from the wood. However, there will still be small concentrations of phenols in the shavings. The concentration of phenols depends on a lot of different factors. Kiln drying also doesn’t remove the above-mentioned acids from the wood.

Cat litter

Cat litter is sometimes indicated as a substrate for small pets but you should never use cat litter as a substrate for your gerbil cage. It has high absorbent properties and can cause obstruction when ingested by your gerbils because the litter will swell up. The structure of cat litter is comparable to pellets and can cause injuries to the feet of your little gerbils. 

Nowadays, there are some unscented and non-clumping cat litters available that are paper-based. But these are not suitable for creating tunnels so it’s best to get some substrate that is designed for gerbils (and rodents in general).


Sand is generally a safe substrate for gerbils but I wouldn’t recommend it as the only substrate you use. It’s a lightweight kind of substrate that gets kick around very easily and can be difficult to clean. Sand isn’t a good substrate if you want to control the odors in the cage and can also dry out which causes tunnels to collapse.

For this reason, I would choose to give only a small bowl of sand to your gerbils so they can get in and clean their fur. I would never use it as a substrate because it needs to stay damp to create good tunnels and other substrates are way better to create stable tunnel networks for your gerbils.

Tips for choosing and using substrate

Now you know the safe and harmful kinds of substrates for gerbils. There are some tips I want to give you for using the substrate. Below you’ll find the 5 most important tips related to substrates: 

  • use a combination of substrate types: most substrates have absorbent properties but lack the sturdiness to let your gerbils create tunnels that don’t collapse. Use different kinds of substrates to benefit from the advantages of each kind of substrate. For example, use a combination of hay, aspen wood shavings, and a paper-based substrate/bedding.
  • the substrate layer should be between 8 and 12 inches (20 to 30 cm) thick: get a thick or deep layer so your gerbils can really create nice tunnels in the substrate. If possible, you should add an even a thicker layer of 40 cm (15.8″) or more. The gerbil handbook by Swiss Animal Welfare even recommends a layer of 70 – 80 cm (27.6-31.5″).
  • don’t use perfumed substrate types: gerbils have very sensitive noses and can get health issues from perfumed bedding.
  • switch the substrate if your gerbils don’t like it or show allergic reactions: it’s possible for gerbils to not like a specific kind of substrate. If you don’t see your gerbils making tunnels and digging switch the substrate type. The same goes for allergic reactions.
  • don’t use substrates that you get from nature: you could think that you can use hay or grass from your own property and use earth and sand from your garden. These substrates can be contaminated with bacteria and can also contain eggs from various insects. Buy your substrate from a reputable seller or distributor and freeze it overnight if you want to be sure that there are no insect eggs in it.

Gerbil Cage Bedding Guide

What’s important when choosing bedding?

When I was talking about the important factors to take into account when choosing a substrate, I already mentioned a lot of the important factors to consider when choosing bedding for nesting material. However, there are some small differences.

In either case, you don’t want your bedding to be toxic. What’s less important is the absorbent properties of the material. Cage bedding – the real bedding, not the substrate – doesn’t cover the entire cage floor.

Some other important factors to consider when choosing cage bedding are:

  • risk of internal and/or external injuries: some cage bedding can look soft and nice but can be ingested and cause impaction (digestive problems) for your gerbils. Sharp edges on bedding materials can also cause injuries to the feet of your gerbils and cloth fibers can get tangled on your gerbils feet or neck and cause life-threatening injuries.
  • break easily and water-soluble: this factor is related to the risk of injuries. Your gerbils should always be able to break or chew through the bedding. When ingested the bedding should dissolve and don’t cause digestive problems.

Safe cage bedding for gerbils

Gerbils love to build nests and stuff them with shredded paper, toilet rolls, shavings, and any kind of material they can find in their cage. The substrates mentioned above will probably be used by your gerbils for their nesting boxes.

But if you want to give your gerbils some extra soft material to line up their sleeping areas, you can best get some bedding materials that are made for this purpose. A little warning: bedding material usually doesn’t have the same absorbent and odor-control properties as a real substrate.

Paper-based bedding

Paper-based substrate can also be used as a bedding material. You can also use shredded stripes of paper and even toilet paper as a bedding for your gerbils. Paper is very soft and your gerbils can tear it to line up their nest. You do have to make sure that you don’t use paper that contains ink as this can be toxic when ingested by your gerbils. Paper shreddings also are a budget option as a bedding material.


Hay is sometimes used as a bedding material but it can get mold and contain dust. The smell of hay can help reduce nasty odors in the cage but it’s not a great substrate because of the lack of absorbency. Sometimes hay can also contain mites that transfer to your gerbils. 

Hay can be used as nesting material on top of the substrate and can sometimes be used by your gerbils to fortify their tunnels. The most common types of hay that can be used are timothy hay, orchard hay, alfalfa hay, and meadow hay.

What bedding to avoid for gerbils?

There’s bedding material out there that’s not suitable for a gerbil. Although the bedding seems to be soft and nice it can be dangerous for your gerbils. Gerbils can ingest bedding when they chew on it. This can in turn cause serious digestive problems and even death. Your gerbil can also get entangled in the small fibers of the bedding, again with injuries as a result.

It’s wise to avoid any of the following bedding:

  • cotton balls
  • felt stripes
  • coconut fibers
  • straw (sharp edges)

Also, avoid any bedding that contains any of the following material:

  • polyester stuffing
  • cotton batting

Recommended Substrate & Bedding for Gerbils

As I already mentioned the terms substrate and bedding are often used as synonyms but there is a difference. Most – if not all – commercial substrate is sold as “bedding”. For your convenience, I will make the difference between the recommended substrate and recommended bedding (as nesting material). 

Recommended substrate

If you choose a single type of substrate I would recommend (in order of preference):

  • paper-based substrate
  • hemp-based substrate
  • aspen wood shavings

Usually, it’s better to mix different kinds of substrate so your gerbils can chew them into a pulp-like material for sturdy tunnels and burrows. Add some hay (like Kaytee Natural Timothy Hay Small Animal Food) to the mix to increase stability. The result can look a bit messy but this doesn’t matter for your gerbils.

Recommended paper-based substrate

In most regions gerbil owners use paper-based substrates like the Carefresh Small Pet Bedding, the Kaytee Clean & Cozy Small Pet Bedding, or the Kaytee Clean & Cozy Extreme Odor Control. These are paper-based substrates that are very absorbent and claim to absorb twice as much water as wood shavings. They also do a great job of controlling odors in the cage. Both are available in different colors so you can choose your preferred color of the substrate.

Recommended hemp-based substrate

A lesser-known kind of substrate is made from hemp. Most hemp-based substrate has the same absorbency as the above-mentioned paper-based substrate and is also great at reducing odors. Hemp-based substrate is usually a better option for pets that seem to be allergic to other substrates (like wood shavings). As hemp-based bedding, I would recommend Hugro Hemp Bedding and Dr. Hemp All Natural Pet Bedding.

Recommended aspen wood shavings

Aspen wood shavings can sometimes cause allergies but shouldn’t be completely discarded as substrate. If you and your gerbils aren’t allergic, you can use aspen wood shavings as a substrate. My recommendations for aspen wood shavings are Kaytee Aspen Small Animal Bedding and Living World Aspen Shavings Small Animal Bedding.

Recommended bedding

For bedding or nesting material, you don’t have to spend a lot of money. You can use hay or safe plant-based products like scentless and chemical-free tissues and toilet paper. Your gerbils will chew these materials in more appropriate bedding. You can also use a paper-based substrate as nesting material.

Substrate & Bedding Studies

Pocket Pets 101 is dedicated to providing you complete advice and information. To give you the best advice we regularly conduct studies and research the scientific studies that are available. Regarding substrate and bedding you can find links to our studies (coming soon) below:

  • absorbency of different kinds of substrate
  • pricing of different kinds of substrate
  • preference of different kinds of substrate by gerbils
  • dust in different kinds of substrate

Also be sure to visit our YouTube Channel and subscribe for reviews about substrate, bedding and nesting material for gerbils and other pocket pets.

Related Questions

How often do I need to clean and replace the substrate?

You should spot-clean the substrate each week and replace the entire bedding at least every month. If you notice that the gerbil cage smells it’s best to replace the bedding and clean the cage at that point. 

Is shredded paper a good bedding?

Shredded paper is a cheap way to provide bedding material to your gerbils. It’s not a good substrate because it doesn’t have a high absorbency and also doesn’t control the odors. You can use shredded pieces of paper to give your gerbils something extra to line up their tunnels.

Is soil a good substrate?

Soil is a natural-looking substrate. It’s often used in reptile tanks but you can also use it as a substrate for gerbils. It’s fairly absorbent but can get messy very fast. It’s best to use other substrates instead of soil which needs to be moist to prevent collapsing tunnels.

Want to Learn More?

If you’re interested in learning more about gerbils as pets, please read the following articles:

If you’re interested in getting gerbils as pets you should also definitely read our beginner’s guide to keeping gerbils as pets and our gerbil care guide.

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