Surely you are going to send it back to S&W for warranty repair.
When mine was a pup he chewed and ruined the TV remote. I heard a crunching sound then I saw the remote in his mouth. The dang dog can chew up and swallow a steak T bone in no time at all. I hadn't thought about what he could do to a poly gun. I will keep all guns where he can't get to them for sure.