Somebody’s backyard cam filmed their dog trotting through a slab of freshly poured concrete. And it’s not a small dog . . . it looks like it might be a Bernese Mountain Dog. It starts with a guy at the back door, who probably did the work because he’s holding a cement trowel. Then the dog comes out the door, and the guy tries to stop him, but no luck. The dog goes right to the wet cement and runs through it leaving deep footprints in his wake.