As one would imagine, hairless rats require more options to warm themselves than their furry siblings. A hairless rat should not be kept alone in a cage, but instead should be accompanied by a second rat for warmth and stimulation. Hairless rats also benefit from increased protein in their diets as the energy spent to keep their bodies warms up their metabolism. Their bare bodies are also susceptible to allergens and irritations from bedding. Use chemical and toxin-free bedding, and eschew pine or cedar shavings, as these can trigger respiratory issues.