What to Know About Hairless Rats

Hairless rats, often called "double-rex" rats, are a unique and increasingly popular variety of pet rat. Their striking appearance, with wrinkled pink skin and large ears, is endearing to many. However, their lack of fur means they have several special care requirements that potential owners must be prepared to meet. They are not simply a standard rat without hair; their needs are different.

The Genetics: Why Are They Hairless?

True hairless rats are the result of a specific genetic combination. The "rex" gene in rats causes curly fur and whiskers. A rat with one copy of the rex gene will have a wavy coat. A rat with two copies of the rex gene (a "double-rex") is often, but not always, completely hairless.

• Appearance: A true hairless rat will have no fur, or may have very short, sparse patches of velvety fuzz, particularly on the face and feet. Their whiskers are typically very short and curled. This lack of protective fur makes them more vulnerable.

Special Care Requirements

1. Temperature Control is Critical:

   • Without a coat, hairless rats cannot regulate their body temperature effectively. They get cold very easily. They must be kept in a warm, draft-free room.
   • Provide plenty of warm bedding materials like fleece and other fabrics for them to snuggle into. Extra hammocks, cubes, and fabric pouches are essential.

2. Higher Metabolism and Dietary Needs:

   • Staying warm requires a lot of energy. Hairless rats have a much higher metabolism than their furred counterparts and need to eat more food to maintain their body weight and temperature.
   • Their diet should be high in protein and fat. It is important to provide constant access to a high-quality lab block.

3. Skin Care:

   • The natural oils that would normally be distributed through a coat of fur can build up on a hairless rat's skin. This can make them feel greasy and can clog pores. They may need to be wiped down occasionally with a damp, warm cloth.
   • Their skin is also very sensitive and prone to scratches and scrapes from rough cage accessories or squabbles with cagemates. It is important to ensure their environment is free of sharp edges.

4. Eye Health:

   • Hairless rats often lack eyelashes, which makes their eyes more susceptible to irritation from dust and bedding. This can lead to more frequent eye infections or irritation.

Social Considerations

Hairless rats can live happily with furred cagemates, and in fact, their furred friends often act as warm, mobile radiators for them to snuggle up against. However, it is important to watch for any signs of excessive grooming. A furred rat may accidentally scratch the delicate skin of a hairless companion while grooming them.

Health Issues

Hairless rats are generally as healthy as standard rats, but they can be more prone to certain issues:

• Respiratory Infections: Because they are more susceptible to cold and drafts, they can be more at risk for developing respiratory infections if not kept in a consistently warm environment.
• Skin Problems: Clogged pores, abscesses from scratches, and skin infections can be more common.
• Mammary Tumors: There is some evidence to suggest that hairless females may be more prone to developing mammary tumors.

Owning a hairless rat can be a wonderful experience. They are known for being particularly affectionate and cuddly, perhaps because they seek out their owners for warmth. However, they are a higher-maintenance pet than a standard rat. Prospective owners must be committed to providing the extra care they need to thrive.