Long-Haired Mouse

Scientific NameMus musculus longhair
Common NameLong-haired Mouse
Care LevelIntermediate
Lifespan1-3 years
Adult Size2.7-4.2 inches (excluding tail)
OriginResult of selective breeding
TemperamentSocial, Curious, Somewhat timid

History & Domestication

The long-haired mouse isn’t a product of natural evolution but a direct result of human intervention through selective breeding. Fascinated by genetic variations, enthusiasts and scientists alike have taken the common house mouse, Mus musculus, and selectively bred them for specific traits, the long-haired gene being one of them. Over the years, these breeding efforts have given rise to this unique variant that boasts a distinctly lavish coat compared to its short-haired counterpart.

The domestication of the long-haired mouse parallels that of its relatives. Originally bred for scientific purposes, their alluring coats quickly gained them favor among pet enthusiasts, and they have since carved a niche for themselves in the pet community.


Long-haired mice, on average, measure between 2.7 to 4.2 inches, excluding their tails. Their longer fur can often give them an illusion of being larger than they actually are. Much like their short-haired counterparts, males generally tend to be slightly larger and more robust than females.


Living for approximately 1 to 3 years, the lifespan of a long-haired mouse is quite similar to other domesticated mice. Their health and longevity largely depend on factors like genetics, diet, care, and environment. With optimal care, some individuals can even surpass this average lifespan.


Breeding long-haired mice is intriguing, especially for those interested in genetics. While they reproduce at a rate similar to other mice, with litters ranging from 5-12 pups after a 19-21 day gestation period, it’s the inheritance of the long hair gene that’s of particular interest. It is a recessive trait, meaning both parents need to carry the gene to produce long-haired offspring.

Unique Features

The standout feature of the long-haired mouse is, without a doubt, its luxuriant coat. This coat can vary in length and thickness, with some mice boasting almost silky fur that drapes elegantly around their bodies. The variety of coat colors and patterns available adds another layer of allure to these creatures, with options ranging from solid colors to mottled or even spotted appearances.

Behavior and Temperament

Much like other mice, long-haired variants are social, curious, and active, particularly during the night. However, their longer fur might make them a bit more cautious and timid, especially in new environments where their fur could get tangled or caught. It’s not uncommon for them to groom themselves frequently, ensuring their longer coats remain clean and tangle-free.


Handling a long-haired mouse requires a gentle touch. Their longer fur can get caught easily, so it’s crucial to be especially delicate when picking them up. Using both hands to scoop them up or allowing them to walk onto your hand is the safest approach. Over time, with consistent, gentle interactions, they can become more accustomed to human touch and even enjoy the occasional petting session.

Grooming Needs

Grooming is a more intensive task for long-haired mice compared to their short-haired counterparts. While they will groom themselves, occasional human intervention can help avoid matting and tangling. A soft-bristle brush can assist in this process, ensuring their coat remains smooth and clean. It’s also essential to keep their living environment clean, reducing the chances of their fur getting soiled.

Diet & Nutrition

An omnivorous diet rich in variety serves the long-haired mouse best. While commercial mouse pellets remain a staple, supplementing their diet with seeds, vegetables, fruits, and occasional protein sources can ensure they receive all the necessary nutrients. Fresh water should always be available, best provided via a sipper bottle to avoid wetting their long fur.


A comfortable temperature range for long-haired mice lies between 65°F to 75°F (18°C to 24°C). Ensuring a stable temperature is crucial as sudden changes can lead to stress, and their longer fur might make them more susceptible to overheating if the environment becomes too warm.

Common Health Issues

Long-haired mice share many of the same health concerns as other domestic mice, including respiratory issues, tumors, and infections. Their unique coats, however, can present additional challenges such as skin issues arising from matted fur, or digestive problems if they ingest their hair while grooming. Regular check-ups and a keen eye for any behavioral changes can help in early detection and treatment of potential health issues.

Habitat Requirements

These mice thrive in a spacious, well-ventilated cage. The flooring should be solid to prevent their fur from getting caught in wire mesh. Soft bedding is preferable, ensuring their longer fur remains clean and unmatted. Providing them with toys, tunnels, and exercise wheels can keep them engaged and active, promoting physical and mental health.

Cost of Care

Caring for a long-haired mouse isn’t particularly expensive, but the additional grooming needs might slightly increase the cost. Regularly replacing bedding, providing a nutritious diet, and ensuring they have entertaining toys are part of the standard care. Their unique grooming needs might necessitate investing in grooming tools like brushes, and perhaps more frequent visits to a veterinarian specializing in small mammals.

Long-Haired Mouse FAQs (Frequently Asked Questions)