(NEWSER) – A horrifying story out of Arizona, where 20 dogs died at a pet boarding facility after one dog apparently chewed through a wire and disabled the air conditioning in the room where 28 dogs were sleeping. Authorities say employees at Green Acre in Gilbert, Arizona, checked on the dogs at 11pm Thursday, then again at 5:30am Friday—and discovered that many were dead and others were "overheated and unresponsive." They took them outside and sprayed them down with water, but were unable to save them, the Arizona Republic reports. Some of the dog owners say the owners of the Green Acre initially called them Saturday and told them their dogs got loose and ran away. (One dog owner provided a voicemail from the facility owners to Fox 10, in which the caller claims to be out searching for the missing dogs.) Some owners went to the facility or sent friends to search, and only then discovered their dogs were actually dead, KPHO reports. One dog did actually get loose, and owners are still searching for him.