dog cart vs sulky

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. 

sulky

noun
  • A low two-wheeled cart, used in harness racing. 

  • Any carriage seating only the driver. 

adj
  • silent and withdrawn after being upset 

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