The September issue of Playstation: The Official Magazine, has offered up a few more details on The Last Guardian.
Apparently, the boy's creature in the game is called Trico (in the Japanese version) and will be hostile to the boy at first.
However, through grooming, playing with it and feeding it, the creature will form a bond with the young lad, eventually helping him to solve platforming puzzles and the like.
Trico is alive and acts it, so persuading it to do as you ask will take a gentle -not forceful- hand.
Some of you may already known this, but there it is just in case.
Via Games Thirst.