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.

3897. CHAPTER 30

In the preliminary section of this chapter - in accordance with the method of presentation adopted previously - those things which the Lord has taught in Matthew 24 about the Last Judgement or final stages of the Church come up for explanation. The preliminary section of the previous chapter explained the contents of Matthew 24:19-22, and now an explanation appears below of verses 23-28, which are,

Then if anyone says to you, Behold, here is the Christ! or There! do not believe it. For false Christs and false prophets will arise, and they will show great signs and wonders, so as to lead astray, if possible, even the elect. Behold, I have told you beforehand. If therefore they say to you, Behold, He is in the wilderness! do not go out; Behold, He is in the inner rooms! do not believe it. For as the lightning comes from the east and is seen as far as the west, so also will the coming of the Son of Man be. For wherever the carcass is, there also the eagles will be gathered together.