I'm glad it isn't just my two!
They even do it when I'm in. And they've got the Skyes joining in!
Between them they've excatated a hole nearly big enough for me to crawl through in the hallway. Eaten all the paper & plaster off so it's down to bare stone
We live in an old cottage & the sitting room has exposed stone on some of the walls, my last Yorkie had a passion for licking out the mortar between the stones.
xx
Emmy