sly as a fox vs vulpinary

sly as a fox

adj

  • Very sly, very cunning. 

vulpinary

adj

  • Crafty, sly, shrewd. 

  • Not spiritual or religious; common. 

  • Relating to a fox. 

How often have the words sly as a fox and vulpinary occurred in a corpus of books? (source: Google Ngram Viewer )