Man installs camera after dog stares at a spot on the wall for days

Huh? What was that?

George decided to use his dog’s enthusiasm as a sort of metal detector. The closer George got to a certain spot on the wall, the happier Crosby became. Especially a spot low to the ground seemed to evoke a very violent reaction in the four-legged friend. George decided to get down on his knees and study the spot carefully.

Suddenly George heard a strange noise. “What the hell was that?” he later heard himself say out loud when he reviewed the security camera footage. With his heart in his throat, George realized there was something in the wall. He turned to Crosby, “Have you heard this all along, kid?”. Crosby didn’t answer, of course.

What could be hiding in the wall?