A group of local pet rat owners had met through an online forum for rat owners and ultimately decided to formalize efforts to find homes for unwanted pet rats. The group of friends joined together to form Any Rat Rescue in the spring of 2004.

Any Rat Rescue (ARR) operates as a network of foster homes throughout the Valley. ARR is incorporated in the State of Arizona and is a registered 501(c)(3) nonprofit organization. The rescue, which is dedicated to finding loving, forever homes for any rat in need, now facilitates adoptions for more than 150 pet rats per year.