Rin Tin Can, possibly the stupidest dog ever, is left in charge of watching the jail.
Lucky Luke refuses to get involved, but when he witnesses the prison guards\' incompetence and Rin Tin Can\'s remarkable lack of brains, he has no choice but to set out on the Daltons\' trail..
Obviously, the Daltons escape and steal some horses and guns.
Rin Tin Can, possibly the stupidest dog ever, is left in charge of watching the jail