<< Is growth and filling out at this rate normal. We have been told that he will not reach full size until nearly 4 yrs (based on his breeding line's history)...I am just wondering. >> I know both my dogs kept filling out till they were about 2, but didn't really mature until 3.5-4 years. I know the consensus seems to be that it is better to keep your dogs light. Elaine and Pico