I was derping around with horses in creative, when I noticed that a baby horse was taking damage. Upon further testing (surrounding a horse with blocks) I found that if a horse is pushed too far into a block then it will take damage.
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I can confirm this. I've seen it happen countless times, it seems that in an attempt to get around the block they keep pushing them selves through it then get stuck and suffocate to death.
It happens in survival also.
new ticket:
MC-92769
its not "Resolved"
Horses and other Animals can after chunkload stuck in wall and die
(Minecraft 1.6.2 - 1.11.2)
That is a separate issue: MC-2025
This does still happen in 1.19: Two of my skeleton horses suffocated to death after I dismounted them in a too small space.
I think this is actually a duplicate of a similar issue.