I have good news and bad news for your situation. The 2 breeds of dogs that you have are the 2 breeds that go through "Puppy stage" for 2 years. Most dogs tend to mature and grow out of their behaviors by the first year or year and half. However, Labs are notorious to stay in puppy mode for 2 years before "Growing Up" Once they do mature they are the best companions ever. Your boxer may mature just a little bit earlier than the lab but expect both to mature slowly.
The good news is they do grow out of this by year 5 they are full adult dogs that are very adult and mature. I had a golden retriever and know alot of boxer owners who have gone through the same thing.
There should be a warning attached to certain breeds of dogs on their maturity level you should expect. Not all breeds are created equal and do have their own quirks. Understanding what to expect out of each breed should make you relax to know everything is normal. Example: Dalmations have a deafness trait in their breed. White long hair dogs can develop hearing problems as well. I have an Eskimo Spitz with hearing issues that is 10 years old. So read up on your breed of dog and find out what other traits to expect. Labs and Boxers are great dogs! Good luck!!!