farrow vs whelpie

farrow

noun
  • A litter of piglets. 

adj
  • Not pregnant; not producing young (not calving) in a given season or year; barren. 

verb
  • To give birth to a (litter of piglets). 

whelpie

noun
  • A small whelp, especially a little cub or puppy; a cur. 

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