Farmboy, unless an animal is a fullblood you'll never be able to figure out what it is up to a 100%. Most Maines or Chi's have many different %'s that won't add up completely to 100% of any one breed. The bloodlines also may contain unregistered Maines that make it more than 50%. All you can do is go by the registation or talk to the breeder to find out what else is in the bloodlines. Usually they just sestimate or round off the %'s. Hope this helps.