ACK!

Last Saturday morning, I noticed Stella chewing on what appeared to be wood. She brought it out from under my bed where she hides things. I took it away from her and looked it over and it looked like baseboard to me. I looked around a bit but couldn't see anyplace where it was missing. That is until today. While doing laundry, I happened to close the door and there's about an inch wide strip between the door and the corner of the wall where the baseboard is gone. I can't prove it happened while the dog sitter was here but I sure think it probably did. I think I would know if she dug at the wall long enough to pull a piece of baseboard away from it while I was here. ARGHHH! What next??