When do they reach full size?

[Will, Larry and TAKODA!]

Takoda  is a Medium Multigenerational Labradoodle. At 5.5 months he is about 18" tall and 31lbs. His Mother was 20" tall and 30  lbs. His Father was 18" tall and 35/40 lbs. When would I expect his growing to be complete. I am hoping for him to be on the bigger side. People who know nothing of the breed think he is going to be around 50 lbs nbased on his age and looks now. I read that you can take a dogs weight at 4 months,  double it and add up to 10 more pounds to get the final full grown estimated weight. Anyone who has any information regading past experience knowledge on this would be appreciated - thanks!

[Gwyndolyn Morasko]

Im learning that the smaller the parent, the quicker they reach full size. Kona was 8 months when he quit growing at 24 pounds. My nieces giant standard didnt quit growing until he was about 16 months old at 120 pounds. I think Nimbus is almost done. Kona never reached 17 inches and I think he's perfect

[Gwyndolyn Morasko]

Nimbus does look like Kona right before he got his curlier adult coat. I loved his long soft baby hair. It was so much easier to comb