Reuben- I started at a 50/50 dog due to this being the highest equal percentage possible and then broke it down until I got under 1 % Pitbull(Pretty close to "pure"). The only reason I could think of doing this would be to add grit or game to a line of Catahoula that lacked it to begin or to bulk a dog from the Mcmillin line. I did Cwards on paper but went with the calculator for UglyDogs question.