Dog in the bathroom

Calm night, traumatic morning. Zorro slumbered peacefully last night, but we were all jolted awake around 6 by a loud and violent thunderstorm. Border collies have extremely sensitive hearing, so a loud thunderclap must sound like someone is banging cymbols next to their ears. Zorro jammed himself in the space between the bed and the wall; later, he cowered in the bathroom. I finally persuaded him to go for a wet, humid walk around 7; unfortunately, it started thundering again mid-walk so we ended up sprinting all the way home. He's in the basement now, another place where he feels safe.