half-breed vs yellow dog

half-breed

noun
  • A hybrid animal or plant. 

  • A person of mixed racial parentage or ancestry, especially one of mixed white and American Indian parentage (metis, métis, Metis, Métis; mestizo). 

adj
  • Having dual heritage; having mixed racial parentage or ancestry. 

  • Hybridized; having one purebred parent; descended from parents of different breeds or with different traits. 

yellow dog

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

  • An item or person of low value. 

  • A Carolina dog. 

How often have the words half-breed and yellow dog occurred in a corpus of books? (source: Google Ngram Viewer )