"Free Life Camp is looking for a pet stone. Specifically, we are looking for a Bear, a Friend of the Forest, or a Spider. White or green quality only! Turning in a green pet stone will give you bonus experience."

Below this text is a slot to drag the pet stone into. I bought a pet stone from the auction house "Bear" level 50 pet. When I press the submit button for this pet stone, it gives me an error "I don't want that kind of pet stone". I tried a chained demon as well just to see if its a true/false logical error and it also failed with the same message.

You would have to submit an unhatched stone.