First aid supplies for your animals are always excellent to have on hand. There are companies that produce ready-made kits of supplies. The Red Cross has even produced books on cat and dog first aid.
It is also an excellent idea to have a "go kit" for your animals. This should contain items like food and water, a litter box (they make pre-packaged disposables) if you have cats and puppy pads or newspaper for other animals. It should also have copies of your animals shot records with the name and number of your vet in a plastic zip-top bag or a waterproof container. If your animals do end up sheltered or fostered, the personnel will need those records. The Go Kits are great when you reach your destination, but are also invaluable if you are trapped in evacuation traffic for hours or if you can't get home and your neighbor needs to look after your animals.
* Canned food is an excellent food for an emergency, and your cat or dog will need less water.
* Consider microchipping your pets - if this is not a possibility for you, take current pictures of you with your animals. After a disaster, things are extremely hectic, confusing and stressful. Microchips and current pictures will help in cases of mistaken identity should your pet become lost or separated from his tags.
* Animal behavior may change DRAMATICALLY in an emergency. Be aware of this and act to keep your pet, yourself and others safe from harm.
* Don't forget the manual can opener!
* Both FEMA and the Red Cross have recommendations for sheltering livestock and other large animals. Check their websites for details.
* One last thing, every single house should have an old-fashioned phone with an attached handset that plugs into the wall. They cost about $10 and are absolutely invaluable when the power is out.