Minimum size - 80cm x 40cm for a small group of mice. 

Mice can be housed in large hamster cages with mouse bars, such as the Barney cage or glass tanks. There are plenty of other suitable tanks on the market. Many people use old fish tanks with a handmade mesh lid. 

The floor space should be a minimum of 40cm x 80cm for a small group of mice. We recommend more space if possible as they are very active rodents.

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Below are some tanks we do recommend for mice. 

For the main substrate, we recommend using - Megazorb, Carefresh, Fitch bedding, shredded card, Auboise, Kaytee clean and cosy or similar products. We also add in cardboard tubes, boxes and egg boxes for them to chew and make nests in.

For nesting material we use hay as it is more natural than most bedding sold and they love to chew it too. You can also use safebed, a shredded tissue like bedding. Never give mice fluffy bedding, the cotton wool like bedding. It can wrap around their limbs, causing nasty injuries and can even lead to their death. 

We never use sawdust or wood shavings as they can cause respiratory issues in mice. 

You can buy mouse or rat food very easily from most pet shops. We avoid using bowls and instead scatter the mice food in their substrate. This is much more natural than a bowl and encourages them to forage providing added stimulation. We also add treats such as dried grass, meal worms and vegetables, though vegetables must be removed before they rot. With mice, we also add in dog biscuits.

Mice usually love wheels. The wheel needs to be a good size to prevent their back arching too much and the wheel needs to be solid. Wheels with gaps in them (typically metal wheels) can lead to tails getting caught.

Un-neutered male mice have a habit of making wooden toys smell! We tend to avoid most shop bought wooden toys due to this. For cheap but entertaining toys, we use cardboard tubes, boxes and egg boxes. We also use wood/branches from fruit tress, mice love to climb and chew these. 

Below are some photos of food enrichment ideas. Stuffing boxes/jars/cardboard tubes/egg boxes with food and hay and letting them chew/dig through or wrapping food in paper are a few things we do here.

Mice are very sociable and are best kept with others. 

Female fancy mice can be kept in same sex groups with usually no problems. Male fancy mice can and should be kept in groups, although there is more risk of fighting between them. To prevent this, we have all our male mice neutered. Male mice can also live with female multimammates. Either way, we strongly feel all mice should have company. 

With groups of un-neutered male mice, we advise giving each of them their own items. So if you have 3 living in a group, they should have 3 houses, 3 bottles, 3 of each toy etc. This tends to help prevent arguments. 

This can be used to introduce female mice or neutered male mice together. It is not advisable to introduce un-neutered male mice together as they will almost certainly fight. 

Here, we have completed many introductions. Mixing multiple neutered male mice together, with female mice and multimammates. 

Mice must be introduced on a neutral territory. A small tank or carrier with very minimal but fresh substrate. Do not add any toys at this point, just some scattered food. 

Mice can be vocal with one another and do squabble, this is normal. Allow them to interact and only separate if either blood is drawn or if one is being a bully. Separate the bully and allow the others to continue to interact. You can add the bully back in 20-30mins later. 

Monitor them for a few hours and is they all seem relaxed (ideally all huddled together), you can add a house for them to hide in. This can help with them cuddling up and exchanging scent. 

We advise to leave them in a small space overnight, then move them to their tank the next morning. The tank must be clean, with no smell of any other mice. Avoid adding toys for a few days and scatter feed to prevent arguments over a bowl.