the typical fur shader is very very hard to pull off right, first you have the issue that it just looks really bad, and other than that, it has to rerender the object 14 times, and then go over every pixel several more times from what i understand. so you might want to look into a differnet option such as attatched polygons with alpha transparancy or something like that, if you cant choose that option, then there is a fur shader on the wiki that works