A site dedicated to Foreclosure Listings gives a bit more insight into the problem:
In Ohio the animal welfare groups are in a huddle trying to find space for an increasing number of abandoned pets. In Arizona concerned pet lovers have set up an e-mail network to find homes for the foreclosed-pets. Stockton is at the centre of the foreclosure and Michael Parker an officer in animal services is a worried man. Thousands of evicted families have temporarily forgotten their pets.
ForeclosureCats.com is a rescue just for cats who have suffered for their owner's poor or unlucky decisions.
The Humane Society has issued a statement urging people not to forget their pets when they are forced to relocate.
The list of sites like this that I found through Google was amazing. And saddening.