Sick as a Dog (Origin)

What Is the Origin of the Saying "Sick as a Dog"?

The term "sick as a dog" means to feel ill to the point of vomiting. The term "sick as a dog" originates from the 1700s, when dogs typically lived outside in poor conditions, causing them to be far mangier, dirtier, and sicker than today's well-groomed show-pieces. People's attitudes towards dogs back then is well captured in the following sayings from the same era:

• I am "in the dog house." (in trouble)
• That is "a dog's breakfast." (a total mess)

In other words, "as sick as a dog" was a simile (a comparison for analogy) that worked well in the 18th century. Back then, all dogs looked sick; therefore, no further explanation was required.

The term is marginally more common than as sick as a parrot, which has several competing theories as to its origin.

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