Unless he is totally out of the norm, he should not grow any taller. And ideally you do not want him to gain a whole lot more weight. From this point on he is just filling out and should not gain more than a few more pounds. His head should get a little more broader and he should get a little more muscular in the hind quarters. His mane, panty feathers and plum on his tail will be at full maturity about 2 years to 2 1/2 years.

Your pups are beautiful!