Herd Hysteria
Hurt one member of the herd and watch the whole flock lose it. Fabric mod for herd and fear behavior for farm animals.
About this Mod
Herd Hysteria
Hurt one member of the herd and watch the whole flock lose it.
In vanilla Minecraft, livestock couldn't care less when their neighbor gets bonked. That cow three blocks away? Totally unbothered. Herd Hysteria fixes that by giving your animals a healthy collective fear response – because nothing says "survival instinct" like fleeing in a group.
How It Works
When any herd animal (cross-species) takes damage, every nearby member within 20 blocks panics and runs from the attacker. No new AI goals, no performance-heavy pathfinding rework – just a clean mixin that tells the herd who hurt them so their existing flee behavior kicks in.
The Herd
Herd Hysteria applies to the herd_hysteria:food_animals entity tag, which includes:
- Cow
- Mooshroom
- Pig
- Sheep
- Chicken
- Rabbit
The tag is data-driven, so pack authors can add or remove entity types with a datapack.
Supported Versions
Herd Hysteria is a Fabric-only mod. Separate JARs are provided for each supported version:
| Release | Versions |
|---|---|
| 1.21.x | 1.21, 1.21.1, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11 |
| 26.x | 26.1, 26.1.2, 26.2 |
Setup
- Install Fabric Loader and Fabric API for your Minecraft version.
- Download the Herd Hysteria JAR that matches your version.
- Drop it into your
mods/folder. - Launch the game – no config needed.
Compatibility
- Server-side only – the mod works on dedicated servers and in singleplayer. Clients connecting to a server with Herd Hysteria do not need it installed.
- No known conflicts with other mods. The mod uses a single mixin on the
actuallyHurt/hurtServermethod and does not replace any vanilla AI goals.
Dependencies
This mod requires Fabric API (Fabric loader).
A LOREal Mod
Available Versions
How to Install Herd Hysteria on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (26.2).
Install Mod
Open the mod browser in the dashboard and search for "Herd Hysteria". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
26.2, 26.1.2, 26.1 (+10 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Herd Hysteria server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (26.2). You can switch loaders with one click in the panel.
Is Herd Hysteria compatible with fabric?
Herd Hysteria officially supports fabric for Minecraft 26.2, 26.1.2, 26.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Herd Hysteria – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Herd Hysteria consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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