Small pet breed

Fancy Mouse

Also known as: Pet Mouse, Mus musculus domesticus

A small, curious and social rodent that's fascinating to watch.

Written by E. S.· Updated October 2026

  • Curious
  • Active
  • Social
  • Intelligent
  • Timid

Fancy mice are domesticated house mice bred for colour and temperament. They are curious, active and intelligent, and females in particular are highly social and happiest in groups. Mice are best for owners who enjoy watching rather than handling, though many can be tamed.

At a glance

Origin
Domesticated worldwide
Size
Small
Weight
0.7–1.4 oz (20–40 g)
Lifespan
1–2 years
Coat
Short, smooth, satin, rex or long fur
Colours
Agouti, Black, White, Champagne, Pied and many more
Average cost
$15–$35 / month

Breed ratings

Rated 1–5 on the same scale as every other entry, so scores are comparable between breeds. Amber stars mark things that cost you effort rather than things that benefit you.

Energy level

Needs a lot of activity every day

Intelligence
Trainability
Affection
Independence
Good with children
Good with other pets
Apartment friendly

Comfortable in a smaller home

Beginner friendly

Forgiving for a first-time owner

Shedding
Grooming needs
Noise level

Temperament

Mice are curious and social; females thrive in groups.

Care & upkeep

Exercise

A multi-level enclosure with tunnels and a solid wheel.

Grooming

No grooming needed; clean bedding often.

Training

Can be tamed and taught simple tasks with food rewards.

Feeding & diet

Typical diet
Pellet-based omnivore diet
Daily amount
Lab blocks or mouse pellets plus fresh foods
Meals per day
Once daily

Pellets should form the base; avoid sugary treats.

Foods to avoid

  • Sugary treats
  • Citrus
  • Onion and garlic
  • Chocolate
  • Sticky foods

Who this breed suits

A good match for

  • Adults and older children
  • Apartments
  • Owners who enjoy observation

Probably not for

  • Owners wanting a cuddly pet
  • Homes with cats

Common health problems

This section describes conditions the breed is known to be predisposed to, so you know what to ask about. It is not veterinary advice and is not a diagnosis — always speak to a vet about your own animal.

  • Respiratory infectionsLinked to dusty or dirty bedding.
  • TumoursCommon in older mice.
  • Skin mitesCause itching and fur loss.
  • Overgrown teethProvide chews to keep teeth worn.

Keep bedding clean and dust-free to protect their lungs.

Interesting facts

  • Mice can recognise their owners.
  • Fancy mouse breeding dates back centuries in Asia.
  • Mice communicate with ultrasonic sounds.

Diet & Feeding

Feed a lab-block or mouse pellet as the base, with small amounts of vegetables and seeds. Avoid sugary treats and keep fresh water available.

Exercise & Enrichment

Provide a large enclosure with multiple levels, tunnels, hides and a solid wheel of at least 20 cm. Mice are very active and need enrichment.

Grooming

No grooming needed. Spot-clean bedding often — mice have a strong smell, especially males.

Health & Vet Care

Watch for respiratory infections, tumours, skin mites and overgrown teeth.

Living with a Fancy Mouse

Female mice should be kept in same-sex groups. Males are often territorial and best housed alone. Mice can be tamed with gentle handling.