Horses are widely domesticated for riding and as beasts of burden.

A horse not trained for war does not normally use its hooves to attack. Its hoof attack is treated as a secondary attack and adds only half the horse?s Strength bonus to damage. (These secondary attacks are noted with an asterisk in the Attack and Full Attack entries for the heavy horse and the light horse.)
SEE WIKIPEDIA ENTRY:

• Horse
  
• Horses in Warfare
  

• Horse, Heavy
  
• Horse, Light
  
• Horse, Heavy Warhorse
  
• Horse, Light Warhorse
  

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System Reference Document -> List of Creatures (SRD)