Dire wereboars in giant form look much like normal hill giants, though slightly stockier, and with coarser, stiffer hair and stiff. The dire wereboar described here is based on a hill giant and natural lycanthrope with normal ability scores for a hill giant.

Dire wereboars anger quickly. They usually begin a battle in giant form, then switch to hybrid form to take advantage of their immense strength in that shape. They like to use their Improved Bull Rush and Improved Sunder feats to shove opponents around and smash their weapons and shields.
Alternate Form (Su): A dire wereboar can assume a bipedal hybrid form or the form of a dire boar.
Boar Empathy (Ex): Communicate with boars and dire boars, and +4 racial bonus on Charisma-based checks against boars and dire boars.
Curse of Lycanthropy (Su): Any humanoid or giant hit by a dire wereboar?s bite attack in animal or hybrid form must succeed on a DC 15 Fortutude save or contract lycanthropy.
Ferocity (Ex): A dire wereboar is such a tenacious combatant that it continues to fight without penalty even while disabled or dying.
SEE WIKIPEDIA ENTRY:

• Giant
  
• Lycanthropy
  

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System Reference Document -> List of Creatures (SRD)