Yup same thing here...I would come home to confetti of wee wee pads! Pee would now be in puddles on the foor b/c the pad were shredded!
I decided to get the Doggie Litter Box and the Washable Pads from the website:
www.piddlepads.com - I would place the washable pad inside the litter box. No more mess!!!
THIS FINALLY STOPPED the shredding. I use the washable ones when they are left home alone and when I am home to occupy the little monsters, I use the throw away kind. I also HEAVILY used the POSTIVE and TREAT reward system!!!