I was given some hairless rats from a breeder not far from me and they did wonderful,, the original ones have since passed on but I do have a daughter from them and am breeding her to a male that is normal haired but who's mom was a hairless, her
babies are being nursed by another mom,, I usually dont sell them untill they are at least 3X the size of a mouse and show no signs of sickness, I feed a really good diet and have had the babies live up to a year. Thier life span is short due to the gene that makes them hairless also affecting the liver or is it kidneys i dont rember Ill have to look it up again unless anyone can answer that before I find it.