Colorado is very fortunate to have a well-organized disaster preparedness program. The Animal Emergency Management Programs are overseen by a full-time Director and staff.  A large amount of information is on their website: www.petaidcolorado.org and click on the tab "disaster services."

There are many levels for volunteering. To find out what is best for you, contact:
Debarh Snackenberger
Director, PetAid Disaster Services
191 Yuma St, Denver, CO 80223
303.539.7633 (office)
303.318.0450 (fax)
866.854.7278 (toll-free)
deborahfoote@petaidcolorado.org

Overall, individual preparedness is the key. Useful information is found on many websites.
Here are a few:

Animal Welfare Institute, planning to take your companion animals: http://awionline.org/content/emergency-preparedness
FEMA, Information for Pet Owners: http://www.fema.gov/plan/prepare/animals.shtm
AVMA disaster preparedness for veterinarians: http://www.avma.org/disaster/
Disaster Planning is for Veterinary Hospitals: http://rebeccarosecvt.com/?p=

CSU Extension emergency preparedness information (Caring for Livestock during Disaster)

Colorado Department of Public Health and Environment

Prepare Colorado Campaign (Colorado Chapters of American Red Cross)

American Red Cross

Mile High Chapter of the American Red Cross