hearing dog
US /ˈhɪrɪŋ dɔɡ/
UK /ˈhɪrɪŋ dɔɡ/
1.
a dog trained to alert a deaf or hard-of-hearing person to sounds, such as a doorbell, telephone, or smoke alarm
:
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My friend relies on her hearing dog to let her know when someone is at the door.
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Training a hearing dog requires patience and specialized techniques.