Where in Tx are you hunting? I've killed dozens of hogs with a bow here in Tx. Some I shoot in the neck although only with a close up shot. Most I'll shoot behind the shoulder. A pig doesn't always leave a very good bloodtrail. The thick hair soaks up a lot of blood so you may not find much on the ground for quite a ways. Persistance is the key to trailing a hog. Also check out the hogs and exotics forum.