every dog has its day

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

• every dog has his day
• every dog must have his day
• every dog must have its day

every dog has its day

1. Everyone, at some point, experiences some degree of success, impact, or influence in life.
   • 1898, [George] Bernard Shaw, “Cæsar and Cleopatra”, in Three Plays for Puritans: The Devil’s Disciple, Cæsar and Cleopatra, & Captain Brassbound’s Conversion, London: Grant Richards, […], published 1901, →OCLC, Act III, page 153:

     cæsar [...] Yes, Rufio: I am an old man—worn out now—true, quite true. [...] Well, every dog has his day; and I have had mine: I cannot complain.

   • 1987 November 5, Thomas George, “Football: First Down, Many Goals to Go”, in New York Times, retrieved 13 July 2015:

     "[T]o lose, it hurt. But I learned from that. I learned that every dog has its day. I learned patience."

   • 2012 August 11, “Europa League: Hearts delight at Liverpool tie”, in Independent, UK, retrieved 13 July 2015:

     The Hearts manager John McGlynn was thrilled to be drawn against Liverpool in the Europa League play-offs. McGlynn said: ". . . . I would imagine the bookmakers would favour Liverpool but every dog has its day."

• even a blind squirrel can find a nut once in a while

• Gregory Y. Titelman, Random House Dictionary of Popular Proverbs and Sayings, 1996, →ISBN, p. 87.