COOL K-9 is based in Boulder, Colorado. Company President Justin Weihs conceived the hydro-garment idea when his spaniel, Jax, suffered heat exhaustion one summer day in 2003. Soon after, Weihs, then a student at the University of Colorado, meet Professor Igor Gamow. Gamow holds ten patents, including the famous "Gamow Bag," which saves lives of people suffering serious altitude sickness.  The two became best friends.  Weihs approached Gamow with his idea, and with the help of Gamow's wife, Elfriede, they produced the first prototype in early 2004.  A patent is pending and the two man team has found success in Colorado pet stores.

Jay Henry, owner of Chow Down Pet Shop says “Everyone who has purchased a COOL K-9 jacket has come back with exceptional feedback.”