What is the name of the stupid prison dog who chases the Dalton brothers?

Explanation

Lucky Luke was created by the Belgian cartoonist Morris and was first published in 1946. Lucky Luke is a real western hero, who draws his gun faster than his own shadow and always hits his goal. He is kind-hearted and intelligent. He acts as a righter of wrongs and rides his horse Jolly Jamper. He is often followed by the stupid dog Rantanplan, who appears whenever the Dalton brothers have escaped prison again.