Hair colour

There is a blonde driving through the country. She has just died her hair brown because she is sick of being made fun of. She is really hungry.

She stops at a farmer’s house and says "Hi! If I can guess how many sheep you have, can I have one?"

Farmer says ok. She quickly counts them and says "91!"

The farmer looks around puzzledly and says "Ok. Take one."

When the Blonde is walking back to her car the farmer asks, "If I can guess your natural hair color, can I have my dog back?"