Free images results:

Harness pictures, stock photos and images


Horses Stock Image
Author: Razvanjp
Young pony Royalty Free Stock Photo
Author: Plsa

Also, here are some commercial RF-licensed images that match your search criteria:  
Harness Royalty Free Stock Photography
Author: Camuka510

Explore more commercial options: More Harness Stock Illustrations & Vectors | More Harness Stock Video Footage