According to the Animal Companion list...<br/><br/>Horse<br/>Starting Statistics<br/><br/>Size Large; Speed 50 ft.; AC +4 natural armor; Attack bite (1d4), 2 hooves* (1d6); Ability Scores Str 16, Dex 13, Con 15, Int 2, Wis 12, Cha 6; Special Qualities low-light vision, scent.<br/><br/>* This is a secondary natural attack, see Combat for more information on how secondary attacks work.<br/><br/>4th-Level Advancement<br/><br/>Ability Scores Str +2, Con +2; Special Qualities combat trained.<br/><br/><br/>You can find the complete list, text and descriptions Here (http://www.d20pfsrd.com/classes/core-classes/druid/animal-companions)<br/><br/>Basically, it's just like another character. You can teach it tricks, give it feats and so on, the page should detail most of it for you. It advances right along beside you, so it's really just like a second character.<br/><br/>Hope that it helps.<br/>