If not kept stimulated in their environment, they will look for something that will give them hours of play. This unfortunately happens to be your furniture, shoe, the leg of a chair or table, etc. The reason dogs chew is mainly our fault, since we don't give them enough toys or don't have time to give them our undivided attention. Most families today work outside the home and therefore spend less time with their pets. The ultimate price is coming home to find that your pet has chewed a hole in your sofa or has eaten your favorite shoe.
Dogs also chew because they are teething.
By the time your pup is 2 months old, he is already looking for ways to chew whatever is in sight. This can go on for over a year before his teething stops. Another option that you have is to buy a spray that keeps your dog off the furniture. This spray has an odor that dogs do not like. Do not stick your dog's nose in it, some dogs do have sensitive noses and these sprays can be quite irritating.