API:UsePetAction

UsePetAction(x,[true])

Arguments

 * x - Pet Actionbar 1-10
 * [true] - optional argument that serves as RightMouseButton

Example
/script UsePetAction(6) Uses the 6. skill

/script UsePetAction(6,true) Makes pet to use skills when available - similar like right clicking this skill (ie with Spirit of the Oak)