cap it all off vs kick a dog when it's down

cap it all off

verb
  • To surpass or outdo something. 

  • To finish or complete something; to add a finishing touch. 

kick a dog when it's down

verb
  • To make things worse for someone in an adverse situation. 

How often have the words cap it all off and kick a dog when it's down occurred in a corpus of books? (source: Google Ngram Viewer )