A tiny, busy, inquisitive little pet best kept as a group of females in a big secure tank — endlessly active to watch, though too small and quick for much handling.
🟢 Tiny & active👀 Watch more than handle👥 Females social⏳ 1.5–2.5 years
Care difficulty
Easy–Moderate
Animal cost
£2–£20 each
Full setup
£80–£200
Adult size
7–10 cm (+ tail)
Lifespan
1.5–2.5 years
Min. enclosure
Secure tank 60×30 cm+ floor
📋At a Glance
Fancy mice are small, active, curious rodents that make lively, low-cost pets — best watched than handled. Females are social and kept in groups; males tend to fight and scent-mark strongly, so are usually kept singly. They need a secure, well-ventilated tank-style home with deep bedding, climbing and a wheel. Great for observing natural behaviour.
Best for: keepers wanting a lively, low-cost group of small rodents to watch (kept as females).
💷Costs & Getting Hold of One
The animal
£2–£6 each.
Full setup
£80–£200 (a secure tank/cage with fine bar spacing, deep bedding, wheel, climbing).
Ongoing costs
Low — food and bedding.
Availability
Easy; buy from reputable sources (avoid feeder stock).
These are minimums, not budgets. The low end still has to meet the animal's needs — proper UVB, a heat gradient, space and filtration are not optional extras. A vivarium alone can cost £250–£300+, and a tortoise's UVB lamp alone is often ~£100. Price the whole setup before you commit to the animal.
Buying tip: Keep females in a group (males fight and smell strongly). Choose bright, active mice with clean coats and clear eyes.
🏠Enclosure & Where to Keep It
Small, agile climbers and burrowers needing a secure, ventilated tank-style home.
Housing
A secure tank or fine-barred cage from around 60×30 cm floor; bigger is better.
Company
Keep females in a group; males usually alone (fighting/odour).
Furnishing
Deep bedding, climbing, hides, a small solid wheel and chews.
Escape-proofing
Very fine gaps only — mice squeeze through tiny spaces.
Males scent-mark strongly and fight — groups should be female; escape-proofing must be thorough.
🌡️Temperature, Lighting & Humidity
Temperature
Comfortable 18–24 °C.
Lighting / UVB
Natural day/night cycle; mostly nocturnal.
Humidity
Keep dry and well-ventilated to reduce odour and protect airways.
Bedding / substrate
Deep dust-extracted paper/aspen bedding; avoid dusty/aromatic shavings.
🍽️Diet, Supplements & Feeding
An omnivore — a quality mouse mix plus small extras.
Staple
A good mouse seed/grain mix or pellets.
Fresh
Small amounts of suitable veg and occasional protein.
Chews
Provide gnawing material for continuously-growing teeth.
Water
Fresh water always available.
Small portions; remove perishable food. Scatter-feeding gives natural foraging.
✨Grooming, Shedding & Additional Needs
They self-groom and stay clean; good ventilation and cleaning control odour. Teeth grow continuously — provide chews.
Lethargy, weight loss or laboured breathing needs prompt veterinary attention in such small animals.
🖐️Handling & Interaction
A watching pet more than a handling one — they're tiny, fast and easily stressed. Some tame to hand-feeding; keep any handling brief and very low.
How to handle
Interact by observation and hand-feeding. If moving one, cup gently and low; never grab or chase, and never lift by the tail tip.
✅ Do
Keep females in a group.
Provide a secure, ventilated tank with deep bedding.
Enjoy them as an active display.
Provide chews and climbing.
Supervise children.
⛔ Don't
Don't group males (fighting/odour).
Don't expect a cuddly, handleable pet.
Don't grab or lift by the tail.
Don't use dusty shavings.
Don't neglect ventilation (odour/airways).
🦎Fun Facts
Tiny, agile and constantly busy — great to watch.
Females are social; males are usually solitary due to fighting and scent.
One of the most-studied animals in science.
Squeeze through astonishingly small gaps.
Domesticated from the house mouse.
⭐Overall Verdict
A lively, inexpensive little pet best kept as a group of females and enjoyed as an active display. Give them a secure, deep-bedded tank with climbing and chews, keep it well-ventilated, and they're fascinating to watch — just not a cuddle pet.