Everyone knows about guide dogs for blind people.
There are also guide dogs for deaf and deaf-blind people. Those dogs are trained to alert their masters when there are some important environmental noises.
Those who serve deaf-blind people are also trained to pick up things, which are dropped on the floor, and bring them back to their masters. This is useful since when, for example, a deaf-blind person loses his keys, he doesn’t hear the noise of their dropping on the floor and once he notices the loss, cannot easily look for them by sight.
People, who need to have such dogs trained in Israel, can contact the Ali Hope nonprofit, which specializes in such a training.