" How would he manage if he became blind?
At least if he was blind he could get a guide dog - there was an upside to everything, a silver lining of helpful Labs and noble German Shepherds eager to be his eyes.
What if he became deaf?
They had dogs for the deaf, too, but Martin wasn´t sure what they did.
Tugged at your sleeve a lot probably while looking meaningfully at things. "

― Kate Atkinson , One Good Turn (Jackson Brodie, #2)