Gerbil Care Guide

Gerbils are not solitary animals. They need at least one companion to stay healthy, both mentally and physically.

In the wild, gerbils live in family groups and spend their time grooming, sleeping next to, and playing with their group members. A single gerbil kept alone will often show signs of depression: lethargy, overgrooming, loss of appetite, and stress behaviors like repetitive digging in one spot.

The best setup is a pair from the same litter, adopted at the same time. Two siblings who have never been separated will usually bond for life. You can also keep groups of three or more, but the risk of social conflict goes up with group size, and you’ll need a larger enclosure.

What to look for when pairing gerbils

• Same litter, same age is the safest bet
• Same sex (two males or two females) unless you want pups
• One naturally dominant gerbil and one or more submissive ones. Two strong personalities in one tank often leads to fighting.
• Avoid adding a new gerbil to an existing group without a proper introduction process, which takes time and a split cage setup

If you already have a single gerbil, it is possible to introduce a new companion, but it requires a specific split-cage method and patience. Rushing introductions can result in serious injury.

Common mistake: Adopting a single gerbil because the pet store said they’re fine alone. They’re not. A solo gerbil is a stressed gerbil.

Declanning is the single most important concept to understand as a gerbil owner. It affects every habitat decision you’ll make.

Gerbils live in tight-knit groups called clans. A clan shares a scent, sleeps in a pile, and grooms each other. Declanning is when that bond breaks down. One or more gerbils get rejected from the group, and what was a peaceful tank becomes a dangerous one.

What declanning looks like in gerbils

• Gerbils sleeping separately instead of in a pile
• One gerbil being chased, cornered, or boxed out of the food and water
• Loud squeaking and boxing (standing on hind legs and shoving each other)
• Bite wounds, especially on the tail or rump
• One gerbil spending all its time in one corner or hide, away from the group

Why gerbil declanning happens

• Too many hides or resources, causing gerbils to spread out and lose their shared scent
• An enclosure that’s too large (yes, too big can cause problems with gerbils, unlike hamsters)
• A new item introduced too quickly that disrupts the environment
• A gerbil returning from a vet visit smelling different
• Maturity. Gerbils that got along as pups sometimes declan as adults.
• Stress from outside sources (loud noises, other pets, moved enclosure)

Why this matters for everything below: Many habitat decisions that are straightforward for hamsters require more thought with gerbils. The number of hides, sand bath access, even enclosure size all need to be balanced against declanning risk. You’ll see this thread throughout the rest of the guide.

For gerbils, a glass tank is almost always the best choice, and the reason is bedding depth.

Gerbils need at least 620 square inches of unbroken floor space for a pair. Add 10 gallons of tank space for each additional gerbil. A 40-gallon breeder tank (36″ x 18″) is a solid starting point for two gerbils. For three, a 55-gallon tank is better.

Unlike hamsters, gerbils kick. A lot. They dig enthusiastically and send bedding flying in every direction. A glass tank contains this mess and lets you build up the 8 to 10 inches of bedding depth that gerbils need for proper tunneling. Wire cages with shallow trays just can’t hold that much substrate, and you’ll spend your life sweeping up bedding.

Enclosure options

• Glass tanks: The standard recommendation. They hold deep bedding, prevent escapes, and let you watch your gerbils tunnel through the sides. A mesh or wire-top lid is essential for ventilation. A 40-gallon breeder for a pair, 55+ gallons for a trio.
• Tank toppers: A wire cage section that sits on top of a glass tank, giving your gerbils a climbing area above their burrowing area. This adds enrichment without sacrificing bedding depth. If you use one, make sure the wire spacing is small enough that your gerbils can’t squeeze through.
• Wire cages: Can work if the base tray is deep enough (6+ inches), but most aren’t. You’ll also deal with constant bedding kickout.
• Bin cages: An affordable DIY option using a large storage bin with a ventilated lid, but visibility is poor and they’re harder to clean than tanks.

Enclosure size and declanning

With gerbils, bigger isn’t always better in the way it is with hamsters. An extremely large enclosure for just two gerbils can actually contribute to declanning because the gerbils may split up and establish separate territories. For a pair, a 40-gallon breeder is a good size. Only go larger if you have a larger group.

Place the enclosure somewhere your gerbils can feel safe. Keep it away from doors you frequently open and close, and out of reach of other pets like cats and dogs. Gerbils are prey animals, and a cat sitting on top of their tank will stress them out even if it can’t get in.

Common mistake: Using the same enclosure logic as hamsters. Gerbils have different social needs that make enclosure size a balancing act, not just a “bigger is better” situation.

Gerbils need deeper bedding than most people expect, and the type of bedding matters more for gerbils than for almost any other small pet.

In the wild, Mongolian gerbils live in complex underground burrow systems. In captivity, the closest you can get to replicating this is deep, sturdy substrate that holds tunnels.

Aim for at least 8 to 10 inches of bedding. Gerbils will tunnel through it, hollow out sleeping chambers, and create a network of passages. Watching them build is one of the best parts of owning gerbils.

The best bedding approach for gerbils

A mix of materials works far better than any single substrate:

• Paper-based bedding (like Kaytee Clean & Cozy or Small Pet Select) is soft and absorbent
• Aspen shavings add structure and help tunnels hold their shape
• Timothy hay layered throughout acts as tunnel reinforcement, a chew material, and an occasional snack

Combine all three. The paper bedding absorbs moisture, the aspen adds rigidity, and the hay binds it all together. This mix creates substrate dense enough to hold complex tunnel systems without collapsing.

What to avoid

• Cedar shavings are toxic to gerbils
• Untreated pine contains phenols that cause respiratory issues. Kiln-dried pine is safer but the mix above is still better.
• Corn cob bedding molds quickly and doesn’t support tunneling. See our article on whether corn cob bedding is safe.
• Cotton-based fluffy nesting material can wrap around limbs and cause injury
• Scented bedding of any kind

Common mistake: Not going deep enough. Six inches is the bare minimum, but gerbils are noticeably happier and more active with 8 to 10 inches. If your tank can hold it, go deeper.

Cleaning

Gerbils are one of the cleaner small pets. They tend to designate a specific corner or spot as their bathroom, separate from where they sleep and burrow. This makes maintenance straightforward.

Spot-clean the bathroom area daily by scooping out soiled bedding and replacing it with a small amount of fresh substrate. Wipe down the wheel every day or two as well.

A full bedding change only needs to happen every two to four weeks. When you do a full clean, leave a handful of the old (unsoiled) bedding in the enclosure so your gerbils can still smell their scent. Removing all of their scent at once can stress a bonded pair and in some cases contribute to declanning.

Gerbils need at least one hide to feel safe, but with gerbils, more is not always better.

The declanning factor

This is where gerbil care diverges sharply from hamster care. With hamsters, you want multiple hides throughout the enclosure. With gerbils, too many hides can cause a bonded pair to start sleeping separately, which weakens their shared scent bond and can trigger declanning.

For a pair, one or two hides is usually right. The goal is for your gerbils to sleep together in the same spot. If you notice them consistently choosing different hides, remove one and see if they consolidate.

What works well

• A multi-chamber wooden hide (so they can sleep together but have room)
• Cardboard boxes (gerbils will chew these up, which is the point)
• Toilet paper rolls and paper towel tubes
• Ceramic or clay hides (sturdy, can’t be chewed, easy to clean)

Gerbils will also build their own tunnel system in the bedding, which often becomes their primary sleeping area. The hides you provide are more of a starting point and a surface-level retreat.

Common mistake: Giving your gerbils five different hides because it seems enriching. Watch where they sleep. If they’re splitting up, reduce the options.

When adding anything new to the enclosure, introduce one item at a time and watch for any changes in your gerbils’ behavior.

Gerbils are naturally clean animals and groom themselves and each other regularly. A sand bath is an extra grooming tool and a source of enrichment, but it needs to be managed carefully with gerbils.

The territorial risk

Some gerbils become territorial over a sand bath, which can trigger conflict and contribute to declanning. For this reason, many experienced gerbil owners don’t leave a sand bath in the enclosure full-time. Instead, offer it during supervised playtime or place it in the enclosure for an hour or two and then remove it.

If you do leave sand in the enclosure permanently, watch how your gerbils interact around it. If one gerbil is guarding it or preventing the other from using it, switch to scheduled access.

What to use

• Reptile sand (calcium-free) or chinchilla bathing sand
• Do not use chinchilla bathing dust. The particles are too fine and can cause respiratory problems.
• A shallow ceramic dish or glass jar works well as a sand bath container

Change or sift the sand regularly, especially if your gerbils use it as a toilet.

Gerbils chew. Constantly. This isn’t a behavior problem. It’s their defining feature as pets, and you need to plan for it.

Gerbil teeth grow continuously, and they need to wear them down through chewing. But beyond dental health, chewing is also how gerbils interact with their environment. They don’t just gnaw on things. They dismantle them. A gerbil’s idea of a good time is systematically shredding a cardboard box into a pile of nesting material over the course of a few days.

Keep a “project” going at all times

The best enrichment strategy for gerbils is simple: always have something in the enclosure that they’re in the process of destroying. This could be:

• A cardboard box (shoe boxes are perfect)
• A stack of toilet paper or paper towel rolls
• A handful of plain tissues or unbleached paper
• Untreated wood blocks or apple wood sticks
• Willow sticks or willow tunnels
• Cork bark pieces

When they finish one project, replace it with the next. A gerbil with nothing to chew is a gerbil that will start chewing the enclosure itself, or worse, its cagemate.

What to avoid

• Anything with ink, glue, staples, or tape
• Treated or painted wood
• Plastic toys (gerbils will chew and ingest the plastic)

Common mistake: Buying expensive small pet toys when a cardboard box from your recycling does a better job. Gerbils don’t care about aesthetics. They care about destruction.

Gerbils are omnivores. Their diet in captivity should reflect the variety they’d eat in the wild: seeds, grains, grasses, vegetables, and some protein.

What to feed

Gerbils do best on a combination of a quality seed mix and a pellet or lab block:

• Seed mix: Provides variety and allows natural foraging behavior. Scatter it through the bedding rather than using a bowl so your gerbils can forage.
• Pellets or lab blocks: Provide consistent nutrition and prevent selective eating. Look for 12% to 16% protein content.

Neither seed mix nor pellets alone is a complete diet. The seed mix gives variety and enrichment. The pellets fill nutritional gaps. Use both.

Fresh foods

Offer small amounts of fresh vegetables regularly: broccoli, carrot, cucumber, and leafy greens all work. Fruit can be given in small quantities as a treat, but keep it limited due to sugar content. Some gerbils also enjoy small amounts of plain cooked egg or mealworms for extra protein.

Timothy hay

Keep Timothy hay available at all times. Gerbils chew it for dental health, use it as nesting material, and eat small amounts. It’s not a primary food source for gerbils, but it serves multiple purposes.

Water

Fresh water should be available 24/7 via a water bottle or a stable, shallow dish. If you use a bottle, check the spout daily to make sure it’s dispensing. Some gerbils prefer a dish, which is fine, just expect bedding to end up in it and change the water more frequently.

Common mistake: Feeding only pellets or only seed mix. Pellet-only diets are boring and don’t allow foraging. Seed-mix-only diets lead to selective eating where your gerbil picks out the sunflower seeds and ignores everything else.

Gerbils are crepuscular, meaning they’re most active at dawn and dusk. This makes them more interactive during waking hours than nocturnal pets like hamsters.

In practice, gerbils follow a pattern of short sleep-wake cycles throughout the day. They’ll be active for a couple of hours, sleep for a couple of hours, and repeat. You’ll see the most sustained activity in the early morning and early evening, but don’t be surprised to see them up and about at random times during the day.

This makes gerbils a good fit for owners who want a pet they can actually watch during reasonable hours. Unlike hamsters, you won’t be waiting until midnight to see yours do anything.

That said, respect their sleep cycles. If your gerbils are sleeping in a pile in their burrow, don’t dig them out or bang on the tank to wake them. They’ll be back up soon enough.

Gerbils are curious by nature and generally easier to tame than hamsters, but it still takes patience and consistency.

Bonding

Start by letting your gerbils settle into their enclosure for several days. Then place your hand flat inside the tank and let them investigate. Gerbils will sniff, climb on, and probably gently nibble your fingers. Gentle nibbling is normal exploratory behavior, not aggression.

Offer treats from your palm: sunflower seeds, pumpkin seeds, or small pieces of vegetable. Over time, your gerbils will associate your hand with good things and start climbing onto it willingly.

Don’t grab your gerbils from above. Like all small prey animals, a hand coming from above looks like a predator. Scoop from below or let them walk onto your hand.

Never pick up a gerbil by its tail. Gerbils are prone to tail slip, where the skin of the tail deglobes if grabbed or pulled. This is painful, permanent, and completely avoidable. Always support their body when picking them up.

Playtime

Once your gerbils are comfortable with handling, set up a small playpen for supervised out-of-tank time. A pet playpen or a ring of cardboard boxes works. Sit inside with them and let them explore, climb on you, and investigate new toys.

Bring enrichment into the playpen: a novel cardboard box, a different sand bath, a new tunnel. The novelty is what makes playtime valuable, not just the space.

Do not use hamster balls. They’re dangerous for all small pets. The ventilation slits can catch toes, the animal has no control over direction, and there’s no access to water. A playpen is safer and more enriching.

Gerbils live 3 to 5 years on average, which is longer than most small pets their size. With good care, some gerbils reach 5 years.

Like all prey animals, gerbils hide signs of illness. By the time you notice something is wrong, the problem may be advanced. Knowing what to look for helps you catch things early.

Signs of illness to watch for

• Lethargy or unusual stillness: A gerbil that’s not active during its normal wake periods may be sick.
• Loss of appetite or sudden weight loss
• Labored breathing, clicking sounds, or discharge from the nose or eyes: Could indicate a respiratory infection.
• Diarrhea or a wet, soiled tail area
• Head tilt or loss of balance: Can indicate an inner ear infection.
• Hair loss or scabby skin: May signal mites, allergies, or a skin condition called nasal dermatitis (red, sore skin around the nose, common in gerbils).
• Overgrown teeth or difficulty eating
• Lumps or swellings: Can be abscesses or tumors. Scent gland tumors on the belly are relatively common in older gerbils.
• Seizures: Some gerbils, particularly those not handled frequently from a young age, are prone to seizures triggered by stress or novel environments. These usually pass quickly and aren’t always cause for alarm, but mention them to your vet.

Tail slip

This is a gerbil-specific concern that every owner needs to know about. If a gerbil’s tail is grabbed or pulled, the skin can slip off, exposing the bone underneath. This is called degloving, and it’s permanent. The exposed portion will eventually dry up and fall off, leaving a shortened tail. It’s painful, prone to infection, and completely preventable. Never pick up a gerbil by the tail, and make sure anyone who handles your gerbils knows this.

Finding a vet

Gerbils require an exotic vet, not a standard dog-and-cat vet. Find one in your area before you have an emergency. The Association of Exotic Mammal Veterinarians has a find-a-vet directory that can help.

This guide is for informational purposes and is not a substitute for professional veterinary advice. If your gerbils are showing signs of illness, consult an exotic vet.

• Best Gerbil Cages and Enclosures
• Best Gerbil Cage Size
• Best Food for Gerbils
• Best Gerbil Bedding
• What Do Gerbils Eat?
• Gerbil Declanning: What It Is and What to Do