What kind of snake has a light colored body with a red stripe down the back?

Question

This one was quite small and the head was round with a slender tail.

Answer 1

a milk snake probably

Answer 2

Either a western ribbon snake or a red striped ribbon snake. Possibly a few species of garter snakes as well.

Answer 3

If it wasn't wild then it sounds like a rosy boa.  

Answer 4

was it in the wild and if so where did you see it.