I used the 2.5% of the body weight as a starting point for Hugo. Depending on your pup's growth, size, need to gain or lose weight, this certainly could be a good guideline for you. As a pup the 2.5% seems a bit low, but again you have to gage it to your growing dog's needs. The 2.5% changes from day to day. IF he is looking a bit too lean, increase it by 1/2-1% and see where that goes. I would supplement this a couple of times a week with some type of veggie mush and maybe a little brown rice, as a filler or treat meal. Vary your meats also. Chicken and turkey is a good staple but dont forget about hamburger, beef stew pieces, beef rib bones, beef livers, tongue (yuck) etc. Eggs are also good a couple of times a week. Just poach or scramble. Supposedly raw eggs are not good for dogs. Biotin in the raw eggs detroy the biotin in the dog's system, something to that effect. One raw egg once in a while shouldnt hurt. You can give cottage cheese and yogurt too. The rmb and meat should be the majority of the diet, but dont leave out the other stuff. There are many who do feed strictly meat with no other veggies or fruits or grains. Alot of them feed the whole carcass, meaning they toss out a rabbit-or other animal- (whole and intact) and let the dog eat it like he made the kill.
Just dont foget Bubba is a growing pup and that you may have to adjust this amount daily. Hugo weighs 88 lbs and he gets approx 1.5%-2% daily and he is 3 years old. Of course you want to keep a large breed lean without too much heavy body fat, especially while growing. Maybe some others will post their experiences with raw feeding and tell you the math they use. Hugo loves the raw diet and he does great on it. Oh forgot to mention that canned fish is also great. Tuna, salmon, sardines, but Hugo seems to have a slight allergy to fish.