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.
Revelation 16:8-11
8
The fourth poured out his bowl on the sun, and it was given to him to scorch men with fire.
9
People were scorched with great heat, and people blasphemed the name of God who has the power over these plagues. They didn't repent and give him glory.
10
The fifth poured out his bowl on the throne of the beast, and his kingdom was darkened. They gnawed their tongues because of the pain,
11
and they blasphemed the God of heaven because of their pains and their sores. They didn't repent of their works.
