Have you come home after several hours away from home to find your puppy has been chewing on your favorite pair of shoes or even the leg of your table? It's not necessarily a behavior problem. Rather, it's likely your puppy is teething. The process of puppy teeth being replaced by their adult teeth starts at about 3-4 months of age, and just as it's painful for our children, so it is for them. It's why they chew and gnaw - both as a self-soothing mechanism and to help urge the adult tooth to emerge.
There are great chew toys and biscuits available specifically for this transition period, from the hard rubber to flavored nylon toys, rings and bones and even chew toys you can freeze so your pup gets extra relief when gnawing. Make sure it's size appropriate for your puppy so they don't quickly lose interest in it. Whichever you choose, make sure it doesn't look like the items in your home you don't want them to chew. For example, stay away from rubber shoe-shaped toys.
Get down on your knees and crawl around your home at puppy level. Are there cords visible and easily accessible by your puppy? If so, you'll want to either remove the cord or consider getting a dog gate to block access to a specific area in your home.