All puppies grow at different rates. My guess is that he got taller too? They grow out, grow up, grow out, etc. I would much rather have a lean healthy dog, then a overweight not healthy dog anyday.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD