We call Kiba the Sock Thief. He absolutely LOVES socks! It's really cute and all, but not so cute when he gets a hold of the dirty socks and tries to chuck them at me so I can play fetch with him.
Some of his other favorites are squeaky stuffed animals (which he enjoys tearing to shreds), and raw hide. I stuck a tennis ball inside of a sock and he seems to enjoy that as well.