I still have this question: Is the lift for the wieght being the 20 is like the man or woman in the floor of but the non-30 in the lbs?
I think, if you add the lbs to the nt wt, you would get oz instead of gms. Then you would have to divide by 13 and add your weight times the age of your dog in human years. That should give you an equation you can put on a really small whiteboard.