My boyfriend's rottweiler is very large and difficult to train?

[Aristes]

He is about 215lb of big puppy. He's two years old and likes to chew everything. He'll only obey one command "Go" when somebody stands up and lurks over him, and even then it's still a fight.

Getting him to sit is difficult because I can't just push on his bottom or back him into a corner; he's been known to push me over when I try.

Any ideas?
Wow. You people are asses. This rot was adopted as an adult, not as a puppy. Try thinking before you insult us.

[auherrie]

Rottweilers will always chew on things, I have one myself and they are very difficult to train even as puppies so a pro may be the best answer.