peon vs running dog

peon

noun
  • A person of low rank or importance. 

  • A messenger, foot soldier, or native policeman. 

  • A lowly person; a peasant or serf; a labourer who is obliged to do menial work. 

running dog

noun
  • A lackey; a lapdog; an unprincipled person who helps or flatters other, more powerful and often evil people. 

How often have the words peon and running dog occurred in a corpus of books? (source: Google Ngram Viewer )