"fit as a butcher's dog" meaning in English

{
  "etymology_text": "Based on the assumption that a butcher's dog is likely to be well fed because of the ready supply of its master's meat.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "fit as a butcher's dog (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English similes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1991 July 4, Mike Selvey, The Guardian, \"Cricket: England out to make it seventh time lucky\"",
          "text": "This time not only is Gooch as fit as a butcher's dog but England, through their efforts at Headingley and Lord's, are mentally attuned to the process of both winning and, crucially in the second match, not losing."
        },
        {
          "ref": "2000 April 16, Nick Nairn, “Sunday Herald”, in Food for Thought",
          "text": "In my eyes, Nick Nairn is still in his early 20s, invincible and as fit as a butcher's dog.",
          "type": "quotation"
        },
        {
          "ref": "2010 July 12, “Runner launches Nottinghamshire's first ultra marathon”, in BBC News",
          "text": "\"I had my midlife crisis at 31 but here I am at 48 and as fit as a butcher's dog,\" he said.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Very fit; in good shape."
      ],
      "id": "en-fit_as_a_butcher's_dog-en-adj-oxhe~P8p",
      "links": [
        [
          "fit",
          "fit"
        ],
        [
          "shape",
          "shape"
        ]
      ],
      "raw_glosses": [
        "(chiefly British) Very fit; in good shape."
      ],
      "tags": [
        "British",
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-fit as a butcher's dog.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/3/3a/En-au-fit_as_a_butcher%27s_dog.ogg/En-au-fit_as_a_butcher%27s_dog.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/3/3a/En-au-fit_as_a_butcher%27s_dog.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "fit as a butcher's dog"
}

{
  "etymology_text": "Based on the assumption that a butcher's dog is likely to be well fed because of the ready supply of its master's meat.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "fit as a butcher's dog (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "British English",
        "English adjectives",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English similes",
        "English terms with audio links",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with quotations",
        "English uncomparable adjectives"
      ],
      "examples": [
        {
          "ref": "1991 July 4, Mike Selvey, The Guardian, \"Cricket: England out to make it seventh time lucky\"",
          "text": "This time not only is Gooch as fit as a butcher's dog but England, through their efforts at Headingley and Lord's, are mentally attuned to the process of both winning and, crucially in the second match, not losing."
        },
        {
          "ref": "2000 April 16, Nick Nairn, “Sunday Herald”, in Food for Thought",
          "text": "In my eyes, Nick Nairn is still in his early 20s, invincible and as fit as a butcher's dog.",
          "type": "quotation"
        },
        {
          "ref": "2010 July 12, “Runner launches Nottinghamshire's first ultra marathon”, in BBC News",
          "text": "\"I had my midlife crisis at 31 but here I am at 48 and as fit as a butcher's dog,\" he said.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Very fit; in good shape."
      ],
      "links": [
        [
          "fit",
          "fit"
        ],
        [
          "shape",
          "shape"
        ]
      ],
      "raw_glosses": [
        "(chiefly British) Very fit; in good shape."
      ],
      "tags": [
        "British",
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-fit as a butcher's dog.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/3/3a/En-au-fit_as_a_butcher%27s_dog.ogg/En-au-fit_as_a_butcher%27s_dog.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/3/3a/En-au-fit_as_a_butcher%27s_dog.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "fit as a butcher's dog"
}