You're supposed to take the 12 week weight and double it - but that doesn't always work.
Jackson weighed 6 pounds at 12 weeks and now he is 14 pounds at 8 months old.
I LOVE his size. He still seems small to me but he's very, very sturdy and can withstand just
about anything. He can be rough housed with other dogs and kids and be fine... he can jump
on and off the bed and couches absolutely fine! I prefer his size