Dog 3 : (1) To secure equipment, such as a ladder. (2) A simple mechanical device used for holding, gripping, or fastening that consists of a pawl, ratchet, or bar used to lock a ladder in an extended position. See also: Ladder Dog
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}