Chewing is how a pup works off extra nervous energy. Little kids scream and run around, pups chew. The more you excersie you’re pup, the less they will chew.
Get a nylabone or hard non-breaking chew toy and let them go to town when in the crate. Don’t use a rawhide chewie – they can get soft and be swallowed whole, then block the G.I. tract. More rawhide chewies are surgically removed from intestines than anything else. ($1000 average price for that!)
Your crate is the best place to leave you’re pup when you are not working with them. Dogs are naturally cave dwellers and will relax in the crate much more than in a open room. Crating the pup will actually take away some of the nervousness and desire to chew. Make sure you can let pup out on a regular basis, but they are better off in the crate than running free.
If pup starts to get a little older (8 months plus) and you are still having issues with chewing, it can be considered a behavioral issue. The most effective way to solve that issue is the use of a “figure 8”.
Here is a link to explain more of that; click the figure 8 video:
http://www.huntsmith.com/resources.php#videos
Good luck!