i googled shelters in Iowa and found some links for you to check out.

http://www.arl-iowa.org/

http://muttcats.com/shelters/iowa.htm

http://www.animal-lifeline.com/

http://www.rustichollowshelter.org/
http://www.wesavepets.com/
http://www.planet-pets.com/free.htm

I hope one of these can help
Melissa