And remember it does end ( the chewing).
I've had four dogs. All of em were demons as puppies. All became excellent teenagers.
Besides exercise I think everybody needs to do some training. You get to choose if they are allowed on furniture or not.
You get to choose if they jump up on people or not.
The steeling food one is tough. I've had a couple that would steel if they were given the opp. Other two won't/didn't do it.
I had one lab that was a fighter. That amazed me....but it was a rescue dog and I'm thinking her experiences led to this.
The jumping on people thing is cured by having buddies come over and give the dog a knee to the chest if it jumps up as they come in the front door. It doesn't hurt the dog and they learn pretty quick.