When I started looking for information on the topic of assistance dogs I found it difficult to find information On hearing dogs.
Most people overlook all of the other skills and abilities dogs have.
Not many people even realize that hearing dogs exist. These dogs are trained to alert their owners of many sounds including the doorbell, the smoke alarm, telephone and the alarm clock. When the smoke alarm goes off, the dog is trained to jump on the deaf person and wake them up. The dog will then bring the person with them. These dogs are trained to the sound of the alarm, not to the fire itself.