1. SolaceDevotio Builder
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    Minecraft Username: SolaceDevotio

    Brief Description: I've had 4 horses disappear today.

    Instructions: I left them and when I came back they were just gone. I know, for sure, that the 4th one could not have been stolen. It was surrounded by a 5 block high wall in a town that only I have perms to. I did that because the other 3 had already disappeared and I thought they must have been stolen.

    How many times did you recreate this bug?: Twice. Once with 3 horses and once with 1.
     
  2. kukelekuuk C͕̹̲̽ͪ͐ͩ̔L̜̦̝͈ͦ̿̾̿ḘA̻̗̤̳̐ͭ̆̿̃̑ͭN̊̓͑̇ͯ
    Builder ⛰️ Ex-EcoLeader ⚜️⚜️⚜️ Premium Upgrade

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    People can attach the horse to a lead and fly away with it, make sure the horse is in a place without openings.
     
  3. CordialBacon Builder
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    I'd suggest locking every single block of your stable with signs and trapdoors for floor and ceiling, that's what I did. 2 high block opnening and be sure there is no possible way a horse could be taken out, even if someone got in.