Sick as a Dog (Origin)

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

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The term "sick as a dog" means to feel ill to the point of vomiting.

Examples of Use:

You look assick as a dog. Do you want to lie down?
I threw up after the meal. Those mussels made me as sick a dog.
I've had too much wine. I'm going to feel as sick as a dog tomorrow.

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.