dog cart vs landau

dog cart

noun
  • A two-wheeled horse-drawn carriage with two transverse seats back to back. The rear seat originally closed up to form a box for carrying dogs. 

  • A cart drawn by a dog. 

landau

noun
  • A type of lightweight, four-wheeled carriage in which the front and back passenger seats face each other. 

  • A style of automobile based around the design of landau carriages. 

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