Once we had two deaf dalmations. As with many deaf humans, they didn't consider themselves disabled and were only mildly inconvenienced by being unable yo hear. They didn't know what they were missing.
Since dogs (and many other animals) naturally communicate using body language, it was easy for them to learn to understand commands in American Sign Language. One of them learned to understand over 300 signs, mostly names of people, animals, places and foods and taught her humans to understand about thirty dog "signs"