Answer:
When the horse strokes the cat, the wood begins to sing.
i'm popular for Knuzlocks what am i
Look into my face and I'm everybody. Scratch my back and I'm nobody.
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What can you lose that will cause other people to lose theirs too?