Rily has averaged about a pound a month. He is 8 months now and weighs about the same...give or take an oz. or two. He was 2.13 lbs. at 12 weeks, so the "double the weight at 12 weeks" really didn't work for him. Rily is long, tall and lean. Saydee is charting about the same, but she is much shorter than Rily. I think each pup is unique and grow at different rates, but believe me, 8 pounds is not big.