Does anyone know where the term 'hair of the dog' for hangover relief came from?!

Does anyone know where the term 'hair of the dog' for hangover relief came from?

The origin of the phrase is literal, and comes from an erroneous method of treatment of a rabid dog bite by placing hair from the dog in the bite wound.[1] The use of the phrase as a metaphor for a hangover treatment dates back to the time of William Shakespeare. Ebenezer Cobham Brewer writes in the Dictionary of Phrase and Fable (1898): "In Scotland it is a popular belief that a few hairs of the dog that bit you applied to the wound will prevent evil consequences. Applied to drinks, it means, if overnight you have indulged too freely, take a glass of the same wine next morning to soothe the nerves. 'If this dog do you bite, soon as out of your bed, take a hair of the tail in the morning.'" He also cites two apocryphal poems containing the phrase, one of which is attributed to Aristophanes. It is possible that the phrase was used to justify an existing practice, and the idea of Similia similibus curantur ("like cures like") dates back at least to the time of Hippocrates.