The only thing is the fenced yard, that is a must. Should it be easy to escape from, please don't get it. But if this is a sturdy fence and no escape from it, then go for it. Being deaf doesn't mean he or she doesn't need love as much, or even lots more than others.
I think that people who give love to animals that are handicapped are really special people and should be known as high quality loving folks. Kudos to you for even thinking of doing this.