Ever found yourself with 58 rock golem mining pets, or 21 herons from fishing shrimps. Well since its a possibility of receiving multiple pets of one variant why don't we have some actual use for them.
I suggest that respective of each game mode you are able to Trade IN your skilling pet for X amount of experience.
Unless multiple pets are being planned on being removed in the future, but if not this is a great way to get rid of all those pesky rock golems you have collecting in your bank for some fantastic experience towards its respective skill.