Minecraft Portable Horses DataPack for Minecraft 1.19.4+ (Requires the latest Pre-Releases for 1.19.4 or higher)
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What it does:
Allows you to quickly store horses in your inventory and automatically mount/dismount them, making horses a way more comfortable way of exploring your world.

How to use:

• This datapack works based on a new item, the Portable Horse Saddle.
• To get a Portable Saddle, this DataPack allows you to craft a regular saddle with 5 leather and 1 gold ingot, and you will also get a Portable Saddle in addition to the regular one for free!
• When thrown, this saddle will capture any horse near it and store it inside, almost like a PokeBall. You will be able to see the horse name and stats on the item. Dropping the item again will respawn a new horse identical to the previous one, and you will automatically mount it using the new 1.19.4 feature. If you do not wish to mount the horse when spawning, you can sneak while dropping the saddle to just spawn the horse without mounting.

Additionally, there is another item this datapack adds: the Horse Shard Of Undying.

• To get a Horse Shard of Undying, you can craft it using 4 gold, 4 leather and a totem of undying. You will get your regular totem of undying back, alongside with a Horse Shard of Undying.
• When thrown, the shard will consume itself to make a horse near it immortal (Invulnerable). This should allow you to explore with your horse without having to worry about them getting hurt and explore the world even more freely.

Additional Notes:

• Non-vanilla NBT on the horse might be lost once it is put inside a portable saddle