Dogs, especially puppies, explore the world with their mouth. They like to chew because it calms them. But it destroys your stuff. Even worse -- they might eat something like a sock that could block their intestines. Break this habit now. Give them chew toys, and take away things they shouldn't gnaw on. If you catch them chewing something they shouldn’t, say “no,” replace the object with an approved toy, and praise them once they are chewing it.