crossbreed vs yellow dog

crossbreed

verb
  • To mate so as to produce a hybrid; interbreed. 

  • To mate (an organism) with another organism so as to produce a hybrid. 

  • To produce (an organism) by the mating of individuals of different breeds, varieties, or species; hybridize. 

noun
  • An organism produced by mating of individuals of different varieties or breeds. 

yellow dog

noun
  • An item or person of low value. 

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

  • A Carolina dog. 

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