This is a interesting topic =)
My little guy is 12 weeks old this weekend, and I was feeding him about 2 1/2 cups a day, but when I brought him to a local dobie breeder to get his ears Re-Taped the lady almost smacked me in the head for not feeding him enough..lol.
She told me to feed him up too 4 cups a day because he is growing so much at this age,she said that as he gets older (10 months) it will start to slow down.Little do I know I guess, I was reading the back of the food bag also on how much too feed him, and it told me 2 cups.
The lady also said a comment to me..I hope I say this right.
What you put into your dog for the first year, you will get back for the next 10yrs (look&structure)