beast of burden vs beastie

beast of burden

noun
  • A draught animal, such as a donkey, mule, llama, camel, horse, or ox, that carries or pulls a load for the benefit of a human. 

  • Any domesticated animal trained to perform tasks for humans, such as a herding dog or trained falcon. 

beastie

noun
  • Beast, animal. 

How often have the words beast of burden and beastie occurred in a corpus of books? (source: Google Ngram Viewer )