Maybe there's no lag, but there's little detail. It's a trade-off
In the Data folder in the game folder, open the Graphics.config file with Notepad. Look for the line starting with 6150. There's three numbers. The two outer numbers if increased will give more detail. For the middle number, lower is better. There's an explination at the top of the page. Try adjusting those numbers until the fur looks better. The trade-off is that the game may lag now.