The warehouse door swung open.
"What are you doing, creeping around out here? It's the middle of the damned–" The security guard's gaze went past the Winchesters and his eyes bulged. "What is that?"
As if in answer, the beast in question gave a ferocious roar and leaped forward.
Two guns spoke together and the black dog crashed to the ground, head ruined.
The guard's eyes went from the dog to Sam to Dean.
Dean grinned.
The guard turned around and went back inside. Locking the door, he continued on his rounds.
He didn't go outside again until after daylight.