Most of the guthooks on drop point knives have proved too small to me for use in gutting game the size of a fairly large deer on up. The best 1 I've used is made by gerber,plastic,only about 11$,and takes replacable utility knife blades.
http://www.smkw.com/webapp/eCommerce/product.jsp?Search.y=12&Search.x=7&range=3 1&SearchText=guthook&Mode=Text&SKU=G45 924