Chewing is normal dog behavior, especially for puppies. The problem is usually the target: cords, furniture, shoes, or something that can splinter or be swallowed.
Start with safety
Block access to dangerous items and call a veterinarian promptly if you think your dog swallowed part of an object, is vomiting, seems painful, or suddenly begins unusual chewing.
Make the right choice easy
Store tempting household items, limit unsupervised access, and offer dog-appropriate chew options matched to the dog's size and chewing style. Supervise new items and discard damaged pieces that could become a swallowing hazard.
Redirect without turning it into a chase
Calmly trade the household item for an appropriate option, then reward engagement with the allowed item. Chasing can accidentally make stolen objects more exciting.
Look at the whole day
Age-appropriate exercise, sniffing, play, rest, food puzzles, and short training sessions can give the dog better outlets. If chewing happens mainly when the dog is alone, investigate possible separation-related distress rather than treating it only as boredom.