The Phrase 'Hair of the Dog' Has Surprisingly Literal Origins

"Hair of the dog" refers to the idea that drinking more alcohol can cure a hangover caused by drinking alcohol the night before. It's a hangover cure based on the concept that "like cures like," suggesting that more alcohol, in small amounts, might ease hangover symptoms.

Typically, this method involves consuming a morning alcoholic drink, like a Bloody Mary or a light beer, to feel better after a night of heavy drinking.

This phrase is particularly popular among those dealing with headaches, nausea or fatigue from a night of too many alcoholic drinks. The theory is that by giving the body a small dose of what caused the hangover — more alcohol — you might soothe the discomfort, at least temporarily.

But remember, while popular belief holds that the "hair of the dog" might be the cure, science disagrees.

The origins of "hair of the dog" date back centuries and come from an unusual old belief.

The phrase comes from the ancient practice of treating a dog bite by applying the hair of the same canine to the wound, believing it would somehow cure or soothe the bite. This method of treatment derives from the concept of "sympathetic magic," where something from the cause of harm is used as a remedy.

Over time, the phrase transformed from healing dog bites to easing hangovers. By the Middle Ages, people were applying the concept to alcohol, suggesting that a small amount of what caused the problem — an alcoholic drink — might cure the hangover.

So while the literal act of using dog hair to heal a bite wound faded, the phrase stuck around, making its way into popular speech as a metaphor for consuming alcohol to relieve hangover symptoms.

In modern usage, "hair of the dog" usually pops up in a social setting when discussing hangover cures after a late night of drinking.

For example, after a night out, you might hear someone say, "I feel awful! I think I need a little hair of the dog," which is a way of suggesting they should have a drink to ease their discomfort. Or at brunch, someone might say, “A Bloody Mary is the perfect hair of the dog!” implying that this particular alcoholic drink is just the right choice for hangover relief.

It's also common to hear it in a more casual, joking manner. If someone looks worse for wear after a party, a friend might say, “Looks like you need the hair of the dog that bit you!” with a grin, suggesting that more alcohol could be the fix.

And whether it's a beer, a cocktail or a little sip of anything alcoholic, the phrase keeps its role in helping people laugh through those rough mornings after too much drinking.

The short answer is no. Scientifically speaking, this theory doesn't hold much water — or beer.

Hangovers happen when your body struggles to break down leftover toxins from alcohol. Adding more alcohol to the mix may temporarily dull your symptoms, but it only delays the inevitable crash as your liver works overtime to detox.

So the "hair of the dog" might provide brief relief by numbing the nerves responsible for your headache or nausea. But this strategy doesn't address dehydration, low blood sugar or the inflammation wreaking havoc on your body.

Most experts agree: Instead of reaching for another drink, rehydrate with water, eat a nutritious meal and let your body recover naturally. Your future self — and your liver — will thank you.

We created this article in conjunction with AI technology, then made sure it was fact-checked and edited by a HowStuffWorks editor.