Long ago in a land with an ailing king, there was a pair of boys who looked exactly alike, a pauper called Mickey and the other, the Crown Prince.
A horse goddess gives birth to three powerful brothers who set out into the Underworld to save three princesses from three evil dragons and reclaim their ancestors' lost kingdom.
Donald is vacationing at a dude ranch. After all the beautiful women pick the best horses, Donald ends up with the sad sack Rover Boy. But Rover Boy wants nothing to do with Donald.
The boys buy mama a new hat for Mother's Day, but on the way home fall in the mud and ruin it. They swap the bad hat with one that a nearby horse is wearing and head home.
Popeye and Olive Oyl can't ignore it when produce vendor Bluto comes by with his terribly overloaded cart, whipping his horse and denying it water. They intervene.
A villain rides into town on a horse in the old West. Woody Woodpecker is hanging out the man's Wanted posters. The villain's horse pleads with Woody to turn the louse in so that they can split the reward.
A young horse says hi to little donkey Spunky. But the horse's mother pulls him away, saying we don't associate with that kind. Spunky makes a few more overtures, and eventually they set off on a chase, running across a bull from time to time. The horse stops to eat a lot of apples and drink far too much water; this leaves him too bloated to move much at all. The two continue to anger the bull, which gives chase; Spunky saves the colt, and they all live in harmony.
Engine Co. No. 1 is replacing faithful fire horse Old Smokey with a new engine, which Der Captain is very proud of. He soon gets a chance to test it, when his panicked wife calls; unfortunately, he's still learning how to use it. As he arrives, the ladder extends to its full range, with the Captain on top and most of the rungs missing.
Barney Bear sets out to capture the world's smallest horse.
Olive sends a farewell letter to Popeye: She's over sailors; it's cowboys for her; she's gone out west, to Bar None Ranch. Popeye immediately travels there to find her - and discovers Bluto runs the place.