I feed Natural Balance to my 4 dogs. They all eat once a day, at 6 pm.
Bitsy is 6 lbs. and eats 1/3 cup a day. She used to eat 1/2 cup, but she's a little chubby and on a diet.
Buster is also 6 lbs. and gets 1/2 cup, but usually only eats 1/3 cup.
Charlie is 7 lbs. and eats 1/2 cup.
Nacey is 13 lbs. and eats 3/4 cup.