Everything from "designer" mixes (especially poodle mixes) to pitties.
Pits, rotties and labs are numerous, often Akitas are available too, but here in Southern California there are even a lot of smaller dogs in the shelters, predominantly Chihuahuas, Lhasas, Shih Tzu's and pugs/pug mixes.
I always say no matter what kind of dog someone is looking for, chances are high you'll find one in the L.A. area shelters. Rare breeds obviously excluded, but anything you can find in a freaking pet store, you'll find at the shelters.
If you go to this site and select "all shelters", "dog" and "all", you will get a good representation, even though it's only from the 6 L.A. county shelters and doesn't include dogs in the 6 city shelters and those of cities that operate their own shelters (e.g. Santa Monica) or the Humane Societies.
http://animalcontrol.co.la.ca.us/html/pages/adoptions/adptSearch.asp
If anyone sees one they like and can arrange for transport, I'll be happy to go and bail 'em out!