When I was in high school, this was an expression used when someone was going off to have sex with someone else.
"Hey girl, where are you going? I though we were hanging out?" And she says, "Oh, I need to go see a man about a dog." And then winks at you. Lol.
by rufkm November 15, 2010
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Commonly used as code to describe smoking a weed, also known as petting the dog or a well behaved dog
Pot head 1: You coming seeing a man about a dog?
Pot head 2: is it a good dog?
by CorrectTerminology December 16, 2014
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In "Cheers" witty and sophisticated Frasier uses this phrase to excuse himself.
Cheers Season 8 Episode 1 Frasier uses it (leaving the bar and heading for the bathroom): "I've got to see a man about an equine."
by eugmak November 9, 2011
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"To see a man about a dog" is the cunning inversion of "to see a woman about a pussy" (to have sex with a woman).
Friend 1: "I've got to see a man about a dog..."
Friend 2 : "ah, and a woman about a pussy"
Friend 1: "you know it!"
by fernandomartinez101 October 25, 2011
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An euphemism used to avoid telling of your true destination, often in reply to an awkward question. In Great Britain, it is commonly used as a euphemism for going to the toilet.
"Are you and your wife coming out tonight?" "Uhhhh, I'm going to see a man about a dog."

"How come you're leaving the table?" "I'm going to see a man about a dog."
by Alexandra July 29, 2004
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