A hearing dog is a specific type of assistance dog specifically selected and trained to assist people who are deaf or hearing impaired by alerting their handler to important sounds , such as doorbells , smoke alarms , ringing telephones , or alarm clocks .

A hearing dog is a special type of assistance dog , who has been selected and trained to help people who are deaf or have hearing problems . The dogs tell their handler when they hear important sounds , such as doorbells , smoke alarms , telephones , or alarm clocks .
