Fancy Rat Variety · Domesticated brown rat (variety, not a separate breed)
Hairless
A near-bald variety that needs extra warmth, soft bedding and careful welfare.
By the WARN Research & Conservation TeamChecked against IUCN Red List & CITES sourcesLast updated
In brief
The Hairless rat has little or no fur, exposing soft, often wrinkled skin. It needs extra warmth, gentle soft bedding and careful management because it is more prone to skin injuries, eye problems and chilling.
Hairless: At a Glance
| Origin | Domesticated brown rat (variety, not a separate breed) |
|---|---|
| Size | Small (body 20–25 cm plus tail) |
| Typical weight | Does 250–400 g; bucks 350–550 g |
| Lifespan | 2–3 years (occasionally longer) |
| Coat & markings | Little to no fur; soft, sometimes wrinkled skin; whiskers often short or curled |
| Temperament | Affectionate, sensitive, warmth-seeking |
| Best suited to | Older children and adults; must be kept in same-sex groups, never alone |
History & Origins
Hairlessness in rats comes from several recessive genes affecting hair and sometimes the immune system. Hairless rats lose heat quickly, scratch and injure their skin more easily, and hairless does may struggle to nurse. Because of these welfare challenges, some clubs discourage breeding them.
Hairless Fun Facts
- Hairless rats feel warm to the touch and seek out cosy spots.
- They burn energy faster to stay warm, so eat a little more.
- Some hairless lines have weaker immune systems.
- They need soft bedding and companions to huddle with for warmth.
Hairless Common Health Issues
Conditions seen more often in this breed, and how owners and vets help manage them. This is general guidance, not veterinary advice — always speak to your vet.
Respiratory disease (mycoplasma)
Most pet rats carry Mycoplasma pulmonis, which can flare into sneezing, laboured breathing and a clicking chest, especially in dusty or ammonia-rich cages.
Care: Use low-dust bedding, keep cages clean and well-ventilated, and see an exotics vet early for antibiotics.
Skin injuries
Hairless and thin-coated rats, and rats housed on rough surfaces or with incompatible cage-mates, are prone to scratches, sores and abrasions on unprotected skin.
Care: Provide soft bedding, smooth-edged furnishings and compatible companions; clean minor wounds and see an exotics vet for non-healing or infected sores.
Mammary tumours
Rats commonly develop mammary lumps — usually benign fibroadenomas but sometimes malignant — that can grow large.
Care: An exotics vet can remove tumours surgically; spaying females greatly reduces the risk.
Help animals in need
World Animal Rescue Network funds partner-led rescue, veterinary care and protection programmes across South Asia, Southeast Asia and South America.
