Horse
In Ezekiel 26:11, this signifies the love of learning or intellectual things. (Arcana Coelestia 3727)
In Revelation 6:2, this signifies the love of understanding the Word. (Apocalypse Revealed 298)
In Zechariah 12:4, this signifies that the intellectual should be filled with falsities. (Arcana Coelestia 2383[2])
In general, 'a horse' signifies knowledge or understanding of the Word. In an opposite sense it signifies the understanding of the Word falsified by reasonings, and likewise destroyed from self-derived intelligence. 'A dead horse' signifies no understanding of truth from the Word.
Joel 3:14-20
14
Multitudes, multitudes in the valley of decision! For the day of Yahweh is near, in the valley of decision.
15
The sun and the moon are darkened, and the stars withdraw their shining.
16
Yahweh will roar from Zion, and thunder from Jerusalem; and the heavens and the earth will shake; but Yahweh will be a refuge to his people, and a stronghold to the children of Israel.
17
"So you will know that I am Yahweh, your God, dwelling in Zion, my holy mountain. Then Jerusalem will be holy, and no strangers will pass through her any more.
18
It will happen in that day, that the mountains will drop down sweet wine, the hills will flow with milk, all the brooks of Judah will flow with waters, and a fountain will come forth from the house of Yahweh, and will water the valley of Shittim.
19
Egypt will be a desolation, and Edom will be a desolate wilderness, for the violence done to the children of Judah, because they have shed innocent blood in their land.
20
But Judah will be inhabited forever, and Jerusalem from generation to generation.
