N sewing necessary. Get an old sock or new one. Thigh high if you will, fill it with rice and tie a knot in the top. Works great for humans or ferrets. If the ferret pees or poops on it....dump the rice, wash the sock, reheat and use again. Just ALWAYS check the sock's temperature and even give it a good shake to spread out the heat so no one is burned! Many vet offices do this to supplement body heat. Good Luck, Cathy Ryan Today is the best day to do a good deed. Feed rescued animals in two clicks http://www.theanimalrescuesite.com/clickToGive/home.faces?siteId=3 [Posted in FML 7773]