I was at the site playing with the size selectors. $44.95 is the minimum purchase. So if you order and an 18"X 24" mat or a mat up to about 4 foot by 4 foot (or there about) the prices will be the same at $44.95. So you may want to go in with a quilt or sewing buddy and purchase a larger piece and cut it down. Remember to ask for one continuous cut.
This would be a good mat for your pet with arthritis. I suppose if you covered it well you could use it for yourself too.
I understand it may have a smell.... is it the smell of wool/sheep or from processing?