pooch vs yellow dog

pooch

noun
  • A dog. 

  • A bulge, an enlarged part. 

  • A dog of mixed breed; a mongrel. 

  • A distended or swelled condition. 

verb
  • To distend, to swell or extend beyond normal limits; usually used with out. 

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 pooch and yellow dog occurred in a corpus of books? (source: Google Ngram Viewer )