Tested 26.3
The Netherite Horse Armor is armor for a horse: put it in the armor slot of a tamed horse's inventory to protect it in fights and falls. Upgraded from diamond horse armor with a netherite ingot, it gives 19 armor points, 3 toughness and knockback resistance, and does not burn. It works like every other horse armor; the Iron Horse Armor page explains how to equip it.
It is made with the Smithing Table from Netherite Upgrade, Diamond Horse Armor and Netherite Ingot.
How to craft
Smithing table 
Template 
Base 
Material Netherite Upgrade + Diamond Horse Armor + Netherite Ingot → Netherite Horse Armor
// Slots with several items cycle through every accepted option.
How Netherite Horse Armor connects
7 links · from the 26.3 game dataUsed with
Same family
Tutorials with Netherite Horse Armor (1)
Netherite Horse Armor · FAQ
How do you get Netherite Horse Armor in Minecraft?
At the Smithing Table: 1 × Netherite Upgrade, 1 × Diamond Horse Armor and 1 × Netherite Ingot give 1 × Netherite Horse Armor.
What is Netherite Horse Armor used for in Minecraft?
It protects a tamed horse when placed in its armor slot. Worn by: Horse and Zombie Horse.
Does Netherite Horse Armor stack?
No: only one per inventory slot.
Does Netherite Horse Armor burn in fire or lava?
No: as a dropped item it resists fire and lava.