Pet mouse enrichment: toys and boredom busters

Why do pet mice need enrichment?

Mice need enrichment because they are busy, clever animals with strong instincts, and a bare cage leaves them stressed and bored. Wild mice can travel many hundreds of metres a day, says the RSPCA, and they dig tunnel systems, forage across a territory and build complex nests. The RSPCA warns that barren cages, stress and lack of stimulation can lead to repetitive behaviours, a sign of poor welfare.

The Crittery, a UK small-animal rescue, puts it bluntly: keeping mice in small tanks with little to do is a common mistake, and bored mice can become seriously depressed. The RSPCA also links too little to do, plus unlimited food, to obesity.

Enrichment is not just toys. RSPCA Australia sorts it into five kinds, and a good setup has all of them:

• Food: finding, digging up and working for food.
• Physical: climbing, running, digging, hiding and nesting.
• Sensory: new smells and tastes, a normal day and night.
• Problem-solving: chewing through card to reach another area, mazes, buried tubes.
• Social: other mice, and calm time with you.

DIY mouse enrichment: foraging ideas

Foraging is the easiest and most useful enrichment, because it uses food you already give. Woodgreen and RSPCA Australia both suggest scattering the daily food and hiding treats in toys and bedding, so mice search for it the way wild mice visit feeding spots across their territory.

1. Scatter the daily nuggets. Sprinkle about a level teaspoon per mouse across the cage floor and shelves instead of using a bowl. It also stops one mouse guarding the food.
2. Bury some. Push a few nuggets or a seed down into the bedding or the dig box so they have to dig.
3. Make paper parcels. Twist a treat into a square of plain, unprinted paper or a cupcake case. Mice unwrap it, then use the paper for nesting.
4. Stuff a tube. Fill a toilet roll tube with hay or shredded paper and a few treats, then fold the ends in.
5. Use a holed box. The Crittery suggests small card boxes with holes, such as chocolate orange boxes, filled with nesting and a treat.
6. Hang it up. Tie a millet spray or a piece of apple wood to the cage roof so mice climb and stretch to reach it.

Count treats as part of the daily food, not extra. Our pet mouse diet guide gives the amounts, and what mice can eat lists safe treats.

How do you set up a mouse cage for climbing and exploring?

Fill the height as well as the floor, with something to grip on every level. The RSPCA says mice like to stay in physical contact with upright surfaces and find bare, open spaces stressful, so a full cage is a calmer cage.

• Hanging ropes; Woodgreen suggests dog tugger rope, and The Crittery recommends sisal rope, which is safe to chew and lasts.
• Ladders, bendy wooden bridges and ramps between levels.
• Apple or willow branches, from trees well away from roads, washed and dried.
• Hammocks and fabric beds; The Crittery says fancy mice prefer ones with two entry holes.
• Parrot toys and ferret nets, which The Crittery suggests as climbing frames for mice.
• Shelves kept low enough that a fall cannot hurt. The RSPCA warns falls can break limbs.

A barred cage makes this easy, because you can tie things to the bars. Layout ideas are in our mouse cage setup guide, and space numbers are in the mouse cage size guide.

Hides and nests: how many does a mouse need?

Give more hides than you have mice, and make each one big enough to turn round in with more than one exit. The RSPCA says mice are prey animals that stay near cover, and that hides with one exit let a mouse get cornered by a cage mate. Watch the group for a day after adding a new hide, in case it starts a squabble.

Mice are keen nest builders and use nesting to keep warm. The RSPCA suggests a mix of hay, shredded paper, paper strips and tissue. Plastic houses are easier to clean than wooden ones, says Woodgreen, while The Crittery notes wood is safer to chew. Coconut shells, wooden houses and cardboard boxes all work as extra nests. Our pick of pet mouse hides and houses shows what to look for.

Digging: how to make a mouse dig box

A dig box gives mice the burrowing they would do in the wild, and it is quick to make. The RSPCA asks for bedding at least 2 cm (¾ in) deep throughout the cage, and Woodgreen suggests a separate dig tray of organic compost or coco coir.

1. Pick a container. A sturdy plastic box or tray, deep enough to hold a good layer of soil and heavy enough not to tip.
2. Fill it. Use coco coir or plain organic compost with nothing added, as Woodgreen suggests. If you soak a coir brick, let it dry until it crumbles.
3. Bury treats. Hide a few nuggets, a seed or a mealworm in it.
4. Add a lid if needed. A box with a mouse-sized hole in the lid keeps the mess in and feels like a burrow.
5. Refresh it. Tip it out and refill when it smells or gets wet, usually at each full clean.

Deep paper bedding across the whole cage works too. Our mouse bedding guide covers safe types and depths.

What wheel and chew toys do mice need?

Mice need a solid, rung-free wheel about 20 cm (8 in) across, plus things to gnaw every day. Woodgreen and The Crittery both recommend an 8 in solid upright wheel, so mice run without arching their backs. The RSPCA asks for a solid, axle-free wheel and says a wheel should never be the only enrichment. The Crittery notes flying saucer wheels can cut squabbles when several mice want to run. See the right wheel for pet mice for the full detail.

Mouse front teeth grow all their lives, so chewing is a need, not a hobby. Good chews are cardboard tubes and boxes, untreated wood, apple and willow sticks, and a piece of plain dog biscuit. Woodgreen warns against coloured chew sticks, and The Crittery against shop toys made mostly of pressed sawdust.

Sound, light and smell: a calm home is enrichment too

Mice hear a very wide range of sound, including ultrasound, and the RSPCA says high-pitched noise and sudden bursts of sound upset them. Keep the cage away from TVs, computer screens, speakers, alarms, phones, sinks and vacuum cleaners, and out of direct sunlight and bright lamps. RSPCA Australia adds a dark, quiet night, no strong smells and no cats or dogs nearby, since even the scent of a predator stresses mice.

How do you keep mice busy outside the cage?

Give supervised play time in a small, safe space. Woodgreen suggests a dry, empty bath with towels in the bottom, or a pop-up or Correx pen, and says well-socialised mice may enjoy an hour or more out each day. Add tubes, boxes and scattered treats, sit in with them and let them climb on you. Keep children supervised and other pets out.

Reward-based training counts as enrichment too, says RSPCA Australia. Teaching a mouse to come for a treat or walk into a tube is the first step in our guide to taming a pet mouse.

Rotating toys: how often to change things

Move or swap a few items every week or two, but never everything at once. RSPCA Australia advises rotating furniture to prevent boredom, and notes mice are wary of new things: they may sniff a new toy, avoid it, then come back once it smells familiar. The RSPCA warns that changing too much, or leaving open spaces, can stress them.

• Keep the main nest and one favourite hide where they are.
• Put back a handful of clean old nesting after a full clean so the cage still smells like home.
• Add one or two new things, such as a fresh box, a new rope route or a rearranged tube.
• Throw away chewed, soiled or soggy cardboard.
• Check every toy for gaps or holes a mouse could get its head or leg stuck in, as Woodgreen warns.

Watching what your mice do with each change teaches you a lot, and our guide to pet mouse behaviour explains what you are seeing. Shopping ideas are in best pet mouse toys, and the bigger picture is in our pet mouse care guide.

Signs your mice need more enrichment

Repetitive behaviour is the clearest sign. The RSPCA links barren, stressful homes to repetitive behaviours that show poor welfare: the same movement, in the same spot, over and over, with no obvious purpose. Fur chewing between cage mates, called barbering, can come from stress or boredom too, says the MSD Veterinary Manual. Rule out illness with a mouse-savvy vet first, as RSPCA Australia advises, then add more to do and more places to hide.