I love Twilight Imperium 4th. edition! Even though the 17 races are a lot, I wonder if there will ever be expansions with new races?
Since we have a cat race, a turtle race, fish race, I wish that the game included a dog race.
What got me thinking about this are the Tines from Vernor Vinge's "A Fire Upon the Deep." It's cool how the Tines are canines and that they form communal packs that then operate as a single entity. In my opinion, they seem like they would play in a way that would be unique from the other TI races but still fit into the TI universe.