Dog Keeps Climbing the Same Tree, Then His Owner Finds This

Expanding a hole

And that’s when the real action began. Max clawed and scratched at the top part of the trunk, causing bits of bark and rotten wood to fall. Jeff watched in fascination as Max continued his efforts. Jeff’s dog was creating or expanding some sort of hole in the top part of the tree, and it appeared he was trying to pull something out. But what was it?