This is no longer a part of the World of Warcraft API. Crafting API was absorbed into Tradeskill API. It was removed in patch 3.0.

Determine if the current 'crafting' skill is the pet training one.

isPetTraining = CraftIsPetTraining()

Returns Edit

isPetTraining 

Boolean - True if the current "crafting" skill is the Hunter's Beast Training; false otherwise.

Details Edit

As of Patch 2.2.3, the only skills which use the Crafting APIs (as opposed to the TradeSkill APIs) are Beast Training and Enchanting; when Beast Training is the active skill, those APIs behave somewhat differently than they do for Enchanting (and than the analogous TradeSkill APIs do for other skills).