The document discusses horse coat colors, patterns, and markings. It describes the five basic coat colors (black, brown, bay, chestnut, white), modifiers like gray and roan, and dilutions such as buckskin, palomino, and cremello. It also covers color patterns including pinto, tobiano, overo and appaloosa patterns. Finally, it lists different types of facial and leg markings like star, snip, blaze and stockings.