oh...I remember those 'destructive puppy days'
Well, he is teething and being a destructive puppy. There are special sprays that you can buy in the ped store to deter 'chewing'.
Mine didn't have 'free run' when no one was home until they were about 1.5 years old
As far as the pee pad shredding, I have to laugh, b/c I can visualize the days that I too had to come home to that
First, I changed over to washable pee pads. Then after a while and they calmed down, I returned to the throw away pads, but I got a doggie liter box and placed the pee pad inside the box. This works great!
Best of Luck!