Go To The Dogs Meaning

(idiomatic, informal) To decline or deteriorate.

Example:   After three years without maintenance, their yard has really gone to the dogs.
1919, W. Somerset Maugham, The Moon and Sixpence, chapter 50
  I suppose there was some kink in Abraham. Poor devil, he's gone to the dogs altogether. He's got some twopenny-halfpenny job in the medical at Alexandria—sanitary officer or something like that.