doggo vs udder

doggo

noun
  • A dog. 

adv
  • Only used in lie doggo. 

udder

noun
  • An organ formed of the mammary glands of female quadruped mammals, particularly ruminants such as cattle, goats, sheep and deer. 

  • A woman's breast. 

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