mongrel vs yellow dog

mongrel

noun
  • Someone or something of mixed kind or uncertain origin, especially a dog. 

  • A thuggish, obnoxious, or contemptible person; (often preceded by "poor") a pitiable person. 

  • An erect penis; an erection. 

adj
  • Of mixed breed, nature, or origin; of or like a mongrel. 

yellow dog

noun
  • A Carolina dog. 

  • An item or person of low value. 

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

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