117 is HUGE for a dobe--they are supposed to be a medium sized dog--males are typically 75-90 pounds as a mature dog.
A typical rule of thumb is to expect your dobe puppy to add about 10 pounds every month for the first few months of his life, so a 6 month old male puppy may weigh 60 pounds or so--65 may be on the big side, but not terribly out of the norm.
This chart may give you an idea of a typical dobe's growth and development.
Of course, some dogs mature early--they grow and add weight relatively quickly and then seem to slow down or even stop by the time they are 7 or 8 months old. Others take their time getting to full height. Most will continue to add muscle mass (5-10 pounds) up until they're 2 years old.
What you're aiming for, though, is for your dog to be the right weight for his height and body build. There's nothing you can do to make him bigger than his body wants to be unless you make him too fat, and obviously, trying to make him smaller isn't healthy either.
So--in an adult dog, you want to be able to feel his ribs easily and actually see the last couple. You want him to have a waist in front of his hips, and a reasonable tuck-up to his belly. You do not want to see rolls of fat at the base of his neck or tail. Puppies can grow unevenly--one day they look fat, the next they look tall and gangly--and they won't have the same muscle development as a grown dog, so it can be a bit difficult to tell--but stick to those guidelines in general and he'll end up weighing what he should.
We'd love to see pictures of your dog (we LOVE pictures) and we might be able to tell you a little more about whether he is a good weight for his body too, if you can post a pic from the side of him standing up. Welcome to Dobermantalk!!