Description: No, this isn't about grooming advice. The phrase goes back centuries - to a folk remedy for rabid dog bites. The cure? Place a hair from the dog that bit you directly in the wound. Treat like with like. The logic was questionable. The phrase stuck anyway. Today it means something far more familiar: having a drink the morning after to ease a hangover. The dog that bit you was the alcohol. The hair is... more alcohol. Medically dubious. Deeply human.