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.
Ezekiel 16:60-62
60
Nevertheless I will remember my covenant with you in the days of your youth, and I will establish to you an everlasting covenant.
61
Then you shall remember your ways, and be ashamed, when you shall receive your sisters, your elder [sisters] and your younger; and I will give them to you for daughters, but not by your covenant.
62
I will establish my covenant with you; and you shall know that I am Yahweh;
