dog-fox vs tod

dog-fox

noun
  • A male fox. 

  • The arctic fox, Vulpes lagopus, and especially the blue fox subspecies. 

  • Any species of the genus Vulpes. 

tod

noun
  • A male fox. 

  • A bush, especially of ivy. 

  • A fox in general. 

  • An old English measure of weight, usually of wool, containing two stone or 28 pounds (13 kg). 

  • Someone like a fox; a crafty person. 

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