While chewing is a normal puppy behavior especially when teething, it is not a standard behavior of mature dogs.   If you have a dog that is destructively chewing, the first thing you must realize is he is not doing it to punish you.  There is a reason behind your dog’s chewing behavior and you must determine this “why” before you will be successful at correcting the problem.

There are numbers of reasons that drive dogs to behave and do the things they do, such as chew.  Pent up energy, loneliness, boredom and lack of dog toys are common reasons dogs channel their emotions and energy on chewing. 

Other not so obvious reasons dogs displays unwanted chewing behaviors, are for affection or attention from his owner, or fear and anxiety when separated and left alone. 

Many people don’t realize this but a dog that misbehaves often receives far more attention then one that is calm and well mannered.   If your dog chews items he shouldn’t while in your presence he is chewing as a way to attract your attention—even if the attention is negative verbal punishing.

All dogs need lots of positive attention every day—playtime, walks in the fresh air, grooming, and affectionate petting, and some require more than others.

If your dog has extra energy and appears to have a chronic case of boredom try scheduling time 2-3 times during the week for special walks allowing him time to investigate, sniff and explore as you walk him on his leash. 

Introduce new commands or tricks and schedule time to teach them daily.
Provide dogs with lots of toys and try rotating the inventory so things appear interesting and new. 

Consider enrolling your dog in a local "doggie day care" a few times per week providing extra exercise.

If your chewer is an attention seeker, the first thing you should do is to try to ignore him while he is behaving badly, and then shower his good behavior with lots of rewarding attention and praise. 

Remember punishing a dog rarely is effective at correcting unwanted behavior problems, as it often makes the problem worse. And verbally scolding your dog after the fact does nothing more than confuse matters.  Your dog doesn't know what he's done wrong; he only knows that you're upset. 

Determine first why your dog is displaying this chewing behavior, than work patiently in the moment trying different ways you can correct and calm your dogs unwanted behavior.