is a normal and healthy behavior for dogs. That keep clean teeth, strong bite and it is pleasures to spend free time.
At some stage the puppy chewing because its teeth grow and through chewing soothe irritation of the process. When the dog starts to chew home furniture or anything that follow, then we have a serious problem. First we need to understand why it does and then we can take steps to resolve this behavior.
Chewing of random objects may mean that your dog has a health problem. Then consultation with veterinarian can help you to solve this problem. In other cases chewing could be due from other circumstances and then is necessary to seek professional help from behaviorist.