My dog's favorite toy is his loofah dog. He has about 7 different ones in 7 different colors. We originally called the first one "Larry", but as we got more and more we had to start naming them after their colors. "Garry" for green "Barry" for blue, and so on. He tugs and tugs on those for hours! When you let go of the toy, he'll sit there with the very defeated look on his face until you offer to play some more.
He also very much enjoys rawhides, bones and things he can chew. He also likes those crinkly toys with things like newspaper and plastic bottles inside them. He doesn't much like balls or things he chases. He doesn't quite understand the concept of fetch. We've been trying to teach him since he was a puppy. Alas, he prefers to chew and to play tug of war.