"every dog has his day" meaning in English

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  "lang_code": "en",
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          "ref": "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:",
          "text": "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.",
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        "Alternative form of every dog has its day"
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  "word": "every dog has his day"
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  "lang_code": "en",
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          "word": "every dog has its day"
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          "text": "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.",
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