I found this cute little cat bed that heats up when they lay on it. Do you think it's safe for piggies to use in winter? Here's the link: http://www.lakeside.com/details.asp?I=PQB&R=11260&Ntt=%3FPQB&N=36 ~Jaime~ ~Mimi the foster piggie~ + ~Molly, Radar & Albert always in our hearts~