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Why does my puppy chew wires? - tv cable extension cord

My dog is part terrier and part schnauner, five to six months and chewed cables, if it is connected by cable-inch TV, cable extension in several places, my printer cable, I really can not. During the day it is a space limit, the night she slept with my daughter, I hear him at night to chew sometimes. Please help to find out why and how a break in the house, to prevent or even gettting damage.