Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Living Organisms (hierarchy name)
4. living organisms (entities)
5. Eukaryota (domain)
6. Animalia (kingdom)
7. Chordata (phylum)
8. Vertebrata (subphylum)
9. Mammalia (class)
10. Perissodactyla (order)
11. Equidae (family)
12. Equus (genus)
13. Equus caballus (species)
14. [horses by size]

Anotations

Scope note:

Horses suitable for riding or light work, and of a size and build between a heavy horse and pony. Light horses are often classified according to their training, including riding horses, racers, trotters, and cow horses.