It's just one piece in the puzzle

So let me start with, it wasn't me....I share this home with several other shelties and two of them are puppies.  Dan and Allana started working on puzzle last night.  Now, I'm not really sure what the purpose of a puzzle is, but it must be somewhat important as all I heard was the sound of a little piece of colored cardboard hit the ground and then a crunching sound.  All of a sudden, Allana yelled "Noooooo!" and I heard Bree swallow quickly and scamper out of the family room.  There are still plenty of pieces of the puzzle to work on, so like I said, I don't know why it was such a big deal that Bree ate one piece.