Seeing Eye...Sheep?

Randomly, in the car tonight:

A: "Mom, you know how there are blind people who have seeing eye dogs?"

M: "Yep."

A: "Well, what happens if the seeing eye dog is blind, too?"

M: "I'm not sure, kiddo. What do you think they could do?

A: "Well, maybe they could get a seeing eye cat? No....that wouldn't work. The dog would chase the cat. Maybe a seeing eye horse? No, the dog would probably get freaked out. Maybe a seeing eye sheep? No...the dog would eat it's wool. Maybe a seeing eye cow? No, because a cow makes milk and so it needs to stay on the farm. Maybe a seeing eye car. No, they would bump into things. And besides, that's super dangerous. I know what would work perfectly!! Another person to be the seeing eye dog!!"