Breeder should be helping you.
Puppies do dumb puppy stuff until they grow out of it. GPs are mature at two tears old. They do grow out of some things earlier than others. Generally females seem to get some sense about 10 months old. Males can take six months longer.
Do not spank, whip, or hit the dog. Get a five gallon bucket and fill with plastic pop bottle that has about three or four gravel in it. Have these about where you can get to them and throw at dog when you see it doing something bad. Yell NO! And throw weighted bottle. The noise more than anything deters dog. You can also tie about 20 feet of parachute cord to dogs collar so you can grab end and give a yank as you yell NO!
If dog needs it, bite their ear and do a full body lift/slam. You bite ear until dog crys out. This is how momma dog disciplines pups. Same for flipping dog on back, you don't have to be overly harsh or hard.
Also, be careful what you feed as too high protein puppy food can make them hyper and make for joint inflammation. Once pup is about 4 months old put them on a good, namebrand adult dog food.
Before i quit I raised over 30 pups and often had eight adults working. I have had them almost thirty years.