Probably because he is stuck living with Cruella de Ville.
This male yellow lab mix (PF63333) is one more dog separated from his owners because someone decided to play God. The person who rescued and/or adopted him obviously knows that he belongs to someone else and yet has made no effort to find the owner(s). Anyone can see in this dog's eyes that he is sad. He's probably thinking about the people he loves.
This is what is written in the description on Petfinder:
This pet was rescued from the disaster area, however contact and location information are not available. This pet is in the database to provide closure so that, if at some later date it is identified by its original owner, they will know it was rescued and cared for. He is happy, healthy, and loved in his new surroundings. This pet is no longer being tracked.
Problem is that the dog was never tracked. This Petfinder Found record was posted on August 11, 2006 - almost a year after Katrina. And the email address that Cruella provided in the Petfinder record - to make sure that his owner(s) have no way to ever contact her - is email@example.com. I guess Cruella, like so many of the evacuees, also didn't have a computer or internet access all year.