Ankle Sharks! Due to the huge Hispanic population in SoCal, and the SouthWest U.S., Chihuahua's are EVERYWHERE! In the streets, shopping carts, back window shelfs in cars, rain gutters, etc.
You can thank Disney and Paris Hilton as well...
UPDATE:
Looks like many will be finding homes all across the U.S. this Christmas thanks to American Airlines and Virgin America
http://www.msnbc.msn.com/id/34490971/ns/us_news-giving/