Striped Prairie Dog?

When I was at Des Moines, IA lastweek, I saw a strange creature by the FlyingJ turned to Love's fuel pump. it's a small prairie dog, shape and all. However, the back has this pattern.

There are some lines or stripes from head to tail, 5 to 7 of them, I couldn't count precisely. The stripes looks something a skunk have, except that it's black on tan, and they cover the whole back. Furthermore, there are blank dots on the stripes, all along the stripe, neatly arranged.

When the creature finally went back, I saw another one standing by a post. What a peculiar creature!

I've never seen such a creature before. How did that come into being? All others I've seen have plain backs.

Visions of newly found species jumped into my head.