Most glass places can order a replacement glass if you can get it apart which being a Pella should be possible. Will probably run you about half the cost of the entire window. If it's a standard size check to see if the local do it yourself stores have one like it that is salvage that you can rob it out of. The bad part about doing the plexi is that you paid for an r value insulation that is no longer there and without the gas in there you will get fogging and then mold.We used to have a dog that was deathly afraid of storms and she destroyed our screen door more times than I want to count. She would try to get in the house even if we weren't at home. So one time we left her inside and she destroyed the screen door to get OUT. They do keep a body entertained!