My Pit is about 70 lbs, , he is at a healthy weight, you can easily feel his ribs with slight fat cover, and he has very well defined muscles. I don't know why he is so large, as for the standard, 30-60, oops! I can't make my baby any smaller, and at sixty pounds he would look severly underweight. Genetics does play a big role, Apollo's dad, and grandpa were both huge.