He's still young, and pups are very destructive (believe me, I know...I have a siberian husky pup who has eaten just about EVERYTHING) My pup has plenty of toys too, and he also really enjoys chewing up trees, I can't keep him away from them. How is the dog getting to your electrical lines? The only thing I think you can really do about that is make sure you keep him away from them, he could get seriously hurt. You can buy a spray called Bitter Apple at Petsmart/Petco. It doesn't effect my dog much, but it's supposed to stop dogs from chewing on things...tastes nasty. You could also try getting toys that are more interesting to the dog. Ones that you can hide treats in such as kongs, milk bone ball, molecuball, etc....it will keep him playing much longer! Good luck!