My female started filling out after she turned a year and I think she is almost done at almost three. She put on 10 pounds from then to now. Not only did she physically changed, she mentally matured. My male also filled out after a year, he is almost two and I think he is done.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD