rescue dog

noun

a dog trained to assist rescue workersSee also search dog
a dog that has been placed in a new home after being abused, neglected, or abandoned by its previous owner

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012