I believe the breeders will say it depends upon the genetics of the dog--some are early growers and some are late. That being said, mine continue to grow at almost 7 months and 9 1/2 months. We track their weight weekly and it has slowed, but not stopped. How much does Marvin gain each week? How much did his parents weigh?
Lincoln grew very fast and ended up to be quite big at 18 pounds. He was about 16 pounds at the end of the the first year, but then put on the other two slowly after that. I think by 10-12 mos. they seem to get as long and tall as they are going to get, and then they kind of "fill out" after that, if that makes sense.
Freddie grew very slow. He even grew taller and heavier up to 2 years old. He is 13 1/2 lbs and 12 inches tall. He outgrew the standard. He was just a squirt when I got him 13 weeks and 3.8 lbs.
Scudder was bigger about 4lbs at 10 weeks. He grew fast and furious. His height stopped at about 6 months and his weight I THINK has finally stopped at 10 1/2 months. He is 9 1/2 inches tall and almost 13 lbs. He is very sturdy and has heavy bones. Most people guess him to be 10-12 lbs.
I got Bella at 7 months old she was 4 lbs and gained 2 more up to a year.
I don't weight Marvin every month, only at doctors appointments and recently on our scale with me holding him. His breeder mentioned that he thought he would be around 9 lbs, which is pretty tiny! He's already 9 lbs, though, at 6 months, so that can't be right. I am just hoping he gets a little taller so that he's a little further away from the snow this winter!