This pet mouse care guide covers everything you need to know about keeping a mouse (Mus musculus) happy and healthy. Small, energetic, and intelligent, pet mice make fascinating companions when given proper attention and care. Though their lifespan is short (1 to 2 years), they can be surprisingly endearing.

General information

• Scientific name: Mus musculus
• Family: Rodent (Muridae)
• Weight: 25 to 40 g
• Lifespan: 1 to 2 years (up to 3 years)

Coat colors and types

Mice are categorized by markings, not breeds, and come in various coat types:

• Markings:
  • Solid: albino, champagne, cinnamon, chocolate, dove, silver
  • Spotted: star, banded, other patterns
  • Tan/fox: different belly color
• Coat types:
  • Standard (short fur)
  • Texel (curly)
  • Angora (long fur)
  • Hairless
  • Fuzz (light body hair)
• Eye colors: black, ruby, red

Personality and social behavior

• Mice are curious and lively, but often timid at first
• They love to explore, but need hiding spots to feel secure
• Can become friendly with patience and gentle handling
• Never pick up a mouse by the tail – it causes severe stress and pain
• Mice have an innate fear of heights and open spaces

💡 Social dynamics:

• Females: usually live well together with gradual introductions
• Males: highly territorial — best housed alone to avoid fights

Reproduction

• Sexual maturity:
  • Males: 6 to 8 weeks
  • Females: 5 to 7 weeks
• Ideal breeding age: 3 to 4 months (not beyond 8 months)
• Gestation: 19 to 21 days (up to 23 for large litters)
• Litter size: 1 to 15 (average: 7 to 10)
• Eyes open: around 14 days
• Weaning: at 21 days, but stay with mother until ~4.5 weeks

Health and common issues

Mice are delicate and prone to several health concerns. Proper bedding, hygiene, and diet are key.

• Respiratory infections: common, often triggered by dusty bedding (especially softwood shavings)
• Tumors, cysts, abscesses: especially mammary tumors, even on the back
• Parasites:
  • External: mites, lice, fleas
  • Internal: intestinal worms
• Diarrhea: must be taken seriously — mice dehydrate quickly
• Barbering: dominant mice may chew off whiskers or fur from cage mates — not dangerous but worth monitoring

With a stimulating environment, proper nutrition, and daily care, a mouse can be an engaging and intelligent pet that brings a lot of charm and curiosity to your home.