Sally has the chance she has dreamed of, to ride the rocking Lazy D range with her grandpa. Then she is told there is a lot of hard work and schooling required. But what a surprise when she learns who her real teacher is to be. Misty the cow pony helps Sally to become a real cowgirl.

Grandpa teaches Sally how to trail range cattle. He says she has to learn to read what cows write. But it takes Misty the cow pony to teach her how to read between the lines.

Riding the Lazy D range with her grandpa, Sally learns what it really means to be a cowgirl, but the most valuable lesson she learns is that danger and sadness cannot destroy a cowgirl's happiness.