In the Middle Ages, people treated a dog bite with the ashes of the canine culprit’s hair.
The medical logic came from the Romans, who believed that the cure of any ailment, including a hangover, could be found in its cause.
It’s a principle applied in modem medicine with the use of vaccines for immunization.
“The hair of the dog” treatment for hangovers advises that to feel better, you should take another drink of the same thing that made you feel sick.
