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hearing-ear dog

[heer-ing-eer]
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noun
  1. a dog that has been trained to alert a hearing-impaired person to sounds, as a telephone ringing or dangerous noises.

Origin of hearing-ear dog

First recorded in 1975–80; on the model of Seeing Eye dog
Also called hearing dog.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for hearing dog

hearing dog

noun
  1. a dog that has been specially trained to help deaf or partially deaf people by alerting them to sounds such as a ringing doorbell, an alarm, etc
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

hearing dog in Medicine

hearing dog

n.
  1. A dog trained to assist a deaf or hearing-impaired person by signaling the occurrence of certain sounds, such as a ringing telephone.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.