[Chubfish]

You should get a whippet, they're awesome and fast and curl up when they sleep. You could also name it "Scout".

Oh yeah and they also have short hair and are of a medium size. A bit like a small greyhound but much cooler.

Edit: The dog in WoF's picture (the one right in the top left hand corner, the kinda white one) looks alot like my whippet. A huge amount like it, it even has the same collar.