I found this great product called Critter Cords for pups who want to chew electrical cords. They are clear soft plastic sheaths you can cut to size and fit around electrical cords. They also have a citrus taste to them which I guess dogs don't like. My little one wanted so bad to chew cords and a friend told me about this product, which she had seen on the HGTV show I Want That! They have worked great in my household. You can order them at:
www.crittercords.com