I can say once Gunther hit around 8 months old, he grew little to none until last month. Since Nov, he was around 118/119 lbs. He gained 5 lbs as of last weigh in about 2 wks ago. So I think he may be starting another growth spurt.
I think alot of it has to do with the dog and what body type they are. Gunther grew the most from 4 mo-8 months, then slowly after that (and he was pretty sick in August, causing him to lose weight). I don't know if there is really a standard for dane growth. Only that they can continue growing until they're around 3. From what I've heard, it's 2 yrs up, and 1 yr out.