Feral Chihuaua and Mangy Labradoodle come with the base game, but you have to buy the others. Unfortunately, the German Shepard is a backer-exclusive, as is the Rotweiler. Similarly, although you'll be able to buy the Black Lab, Chocolate Lab, and Yellow Lab, backers get all three plus the Fox Red and Silver Labs (still all American, though - English labs are supposedly coming in a silver edition of the game). Why they will be charging more for Beagle than the Basset is anybody's guess - who wouldn't want be a Basset roaming around the Post Apocalypse?
Personally, I'm liking the Wheatland Terrier (looks just like my old puppy!) but the fact that you have to pay a monthly fee to keep the fur trimmed is just going too far.