A guide for providing a controlled cut down a longitudinal length of a spine of a carcass using a backsaw includes first and second guide members, wherein the guide members are preferably interconnected by a lateral bracing member. The guide members are fixedly secured to a blade guide of the backsaw. The guide members include a front surface sloped relative to the front of the blade guide. In use, the guide members contact the carcass on either side of the spine and maintain a blade alignment down the spinal column of the carcass.