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:

Any of several breeds of small horses typically standing less than 14.2 hands (56.8 inches) high and noted for gentleness and endurance. Some breeds are not considered ponies, even if they are under 14.2 hands high.