dog's breakfast vs omnishambles

dog's breakfast

noun
  • An unappealing mixture; a disorderly situation; a mess. 

  • Used other than figuratively or idiomatically: see dog, breakfast. 

omnishambles

noun
  • A situation that is bad or mismanaged in every way. 

How often have the words dog's breakfast and omnishambles occurred in a corpus of books? (source: Google Ngram Viewer )