Sounds like more exercise is in order.
Seems like exercise is the answer to 99% of behavior problems.
I tell you one thing....
You could exercise him all day....& he still could go....go....go.
I like talking him for long assed walks when I can...that wears him out pretty good.
I discovered the 'red dot' about 6 months ago. It's one of those pet red laser dot things. Anyways...I can stand in one place in a field & move that thing back & forth & he'll run full steam for a while. I don't like running him too hard or too much because of his age/weight. So it's usually in a nice soft grassy field.
I also picked him up one of those "indestructible" balls. They're like 14" in diameter...hard plastic thats hollow (fill with water/sand).
I'll take him in a field & play soccer. He's actually quite the ball hog but a damn good soccer player - lol.
I tried normal balls (soccer, basketball, football) but he pops them within the first 5 seconds.
I even gave him an 8lb medicine ball & in 10 seconds....he was destroying it - lol....so I had to take that away.
I bought this one toy that is a giant rope ball knot & must weigh about 10 pounds. He swings that thing like a mad man in his mouth.