Needs review
Source: Races of the Wild

Description: You have trained to use your large body and unique physiology against your foes.

Prerequisites: DEX 15, Centaur

When you attempt to overrun an opponent, your target may not choose to avoid you. You may make one hoof attack against any target you knock down (remember that prone targets take a -4 penalty to Armor Class). See Overrun.

Special

A centaur fighter may select Centaur Trample as a bonus feat.

The DM may make this feat available to other centaur like races if they are available in your campaign.