Well isn't he handsome. They do grow like weeds. I really remember with Charlie. He was around 10lbs. when we got him. 2 months later he was 35lbs. I couldn't believe it, at 8 months he was tall and weighed almost 70lbs. then. He continued to grow up, not out after that.
Training has been difficult to be honest. He is pretty much potty trained, except a few accidents in his crate (I blame that on me, b/c sometimes he's in there for a whole work day). Never an accident at night (he sleeps in his crate). He knows, the basic commands (sit, lay, paw etc.). However, he is not so good at "come" or "down" etc. He is jumpy on everyone that comes over, and he won't "come" when asked. Those are 2 or our biggest problems. We are working on it. I am looking in obedience training. Boxers are not easy (at least mine), but they are so loveable.