This is what I had always understood it to mean, was unaware of any other meaning:
Gone to the dogs
Meaning: Someone who has worsened in appearance, character or behaviour.
Origin: This is an analogy to the scraps of waste food etc that were thrown to dogs from medieval baronial dining tables. They were of no other use. Thus, if someone is said to have 'gone to the dogs', he is also regarded as worthless.
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Edited 1 time(s). Last edit at 10/10/2021 09:38AM by JohnnySansCulo.