Every Dog Has Its Day
The phrase “Every dog has its day” is over 450 years old, and the impulse beneath the phrase even older.
It was popularized by William Shakespeare in his play Hamlet, but it had been used in various forms before that. The phrase means that success is available to everyone, or that everyone will experience success at some point in their life.
For example, you might say, “Don’t worry, you’ll get chosen for the team. Every dog has its day.” or “You may become famous someday. Every dog has his day.” The idiom “every dog has its day” means that everyone will eventually have their chance to succeed. It is a reminder that no matter how humble your beginnings, you have the potential to achieve great things.
The proverb was first recorded in the first century by Plutarch as: “Even a dog gets his revenge.” It comes closer to the modern version with Richard Taverner in Adages, 1539 as “A dogge hath a day.”
Hamlet: to Laertes
"Hear you, sir,
What is the reason that you use me thus?
I loved you ever. But it is no matter.
Let Hercules himself do what he may,
The cat will mew, and dog will have his day."
https://nosweatshakespeare.com/quotes/famous/every-dog-has-its-day/