What does this expression mean: "the dog and pony show"?

[Titilili]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #612 "Real Life: Business Jargon (2)", question 10

Our manager wants us to come to work in a suit and tie tomorrow. I haven't worn my suit in three years. I have to wear it for the ......... and pony show tomorrow. Apparently, our boss thinks he'll look good in front of the CEO if we are all dressed in suits.

(a) cat
(b) bird
(c) turtle
(d) dog

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #612 "Real Life: Business Jargon (2)", answer 10

Our manager wants us to come to work in a suit and tie tomorrow. I haven't worn my suit in three years. I have to wear it for the dog and pony show tomorrow. Apparently, our boss thinks he'll look good in front of the CEO if we are all dressed in suits.

Correct answer: (d) dog

Your answer was: incorrect
Our manager wants us to come to work in a suit and tie tomorrow. I haven't worn my suit in three years. I have to wear it for the turtle and pony show tomorrow. Apparently, our boss thinks he'll look good in front of the CEO if we are all dressed in suits.
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Hello,
Could someone explains me the meaning of this expression "the dog and pony show"?
Thanks in advance

[Mister Micawber]

dog and pony show= An elaborate presentation orchestrated to gain approval, as for a policy or product.
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Native English teacher at Mister Micawber's