Blonde who died her hair

There is this ditsy blond who one day said "I had enough of being
treated like the dumb blond bimbo, I want to be treated like everyone
else".   So she cuts her hair way short, dyes it dark brown, wears 
clothes which don't show off her figure, changes job, etc.

A couple of weeks later she is driving along a dirt road and comes 
across a farmer who is crossing the road with his flock of sheep.  
She's thinking, 'here is my chance to prove to them I am no longer 
a dumb blonde'....

Girl to farmer: "I bet I can tell you exactly how many sheep you 
have in this flock and if I do, you let me take one"

Farmer:   "sure"   (thinking she'll never get it)

Girl to Farmer:  "642"

Farmer:   "That's exactly right, I don't know how you knew but go 
ahead and choose one"

The girl looks around and after a while she finally chooses a small 
who was much more active, running and jumping around than the others.

Farmer says "OK, now if I guess your true hair color can I have my 
DOG back."