As Ike Pigott points out in his post today, many shelters won't accept pets.
I had to evacuate my apartment two blocks south of the World Trade Center on 9/11, and there was no way I was leaving Benny's predecessor, my wonderful Yellow Lab, Sam, behind. We stayed with friends for a couple of nights but eventually spent nearly two months in a wonderful hotel that accepts pets.
Please check now to see what hotels and motels in your area accept pets and keep that list with your emergency supplies. Many large chains welcome pets, including:
Red Roof Inn
Sierra Cares Animal Advocates and other animal rescue organizations advise "If you evacuate your home, Do Not Leave Your Pets Behind! Pets most likely cannot survive on their own; and if by some remote chance they do, you may not be able to find them when you return."