R.M.
I would say newspaper also. You want to keep the area clean so they don't get sick. I would reccommend newspaper under your entire pen and then place a blanket or two down in one area of the pen. Dogs do not like to soil their sleeping quarters so hopefully soon they will learn to go only on the newspaper. Also, for warmth I used to use a stuffed animal that had a zipper opening for a hot water bottle. I used it for my Yorkie when she was a puppy. It worked like a charm and because it was a stuffed animal I think she was more comfortable with it. I do not recall where I got it, but I will look into that. The water bottle got destroyed when I got my Irish Setter puppy and she chewed through it :(
R. McConathy
Bella Star Pet Services
www.bellastarpetservices.com