If that's the worst thing he has ever done, consider yourself fortunate. I used to have a yellow lab, who has since passed on, that had a fondness for electrical cords. For some odd reason he would only chew them it they were plugged in. The one time I remember most was coming home and finding the cord to my vacuum cleaner chewed right through with the one end still plugged into the outlet and he greets me at the door like nothing happened. Can't tell you how many different cords I replaced over the years.