The High and the Flighty is a 1956 Warner Bros. Merrie Melodies cartoon directed by Robert McKimson and written by Tedd Pierce.
Daffy Duck is a traveling salesman for the Ace Novelty Company of Walla Walla, Washington, when he witnesses Foghorn Leghorn and the Barnyard Dawg in one of their familiar alternating scraps (Foghorn is seen awakening the dog by lifting him up by the tail and repeatedly slapping his rear end with a board which causes the dog to chase him.
Daffy enters with his traveling salesman suitcase of novelty joke items and offers to help Foghorn get back at the dog by selling him a trick bone that is spring-loaded.
Naturally, as Foghorn wants to get back at the dog with an even bigger prank, Daffy sells him something called the Chattanooga Choo Choo where Foghorn plays a gramophone record of steam train sound effects and charges towards the doghouse with a cutout of the front of a steam locomotive, smoking a corn-cob pipe to simulate the train's smoke.
He lifts his doghouse so that Foghorn misses, causing the rooster to leave the yard through an open gate and find himself on a nearby railroad track, getting hit by a real train.