Blonde joke of the day

I have found really fantastic blonde joke:

A dumb blonde was really tired of being made fun of, so she decided to have her hair she would look like a brunette.
When she had brown hair, she decided to take a drive in the country.
After she had been driving for a while, she saw a farmer and a flock of sheep and thought:
- Oh! Those sheep are so adorable!
She got out and walked over to the farmer and said,
- If I can guess how many sheep you have, can I take one home?
The farmer, being a bit of a gambler himself, said she could have a try.
The blonde looked at the flock and guessed, "157."
The farmer was amazed - she was right! So the blonde, (who looked like a brunette), picked one out and got back into her car.
Before she left, farmer walked up to her and said:
- If I can guess the real color of your hair, can I have my dog back?