Blonde joke

There was this blonde driving down the road and she saw a man and he had a herd of sheep. and she wanted one and o she stopped and asked "can i have one of those sheep?" the man replied and said "if you guess exactly how many sheep i have i will give you one." so the blonde took a wild guess and said, "i think there is 150 sheep." The man looked at the blonde in amazement and, "you are exactly right." so the blonde picked out the sheep that she wanted and put it in her car and started driving. She looked in her real ciew mirror and saw the man running after her car so she stopped. the man looked at her said "You said a sheep not my dog.'