they have a great pattern here i just made austin one i made it big and traced it on my fabric (ill have pictures soon) it came out AWESOME and i have to share the site with you if i can do so can you its really easy heres the link
http://sewing.circleofcrafters.com/freepetvestpattern.html
http://sewing.circleofcrafters.com/freepetvestpattern.html