This was inspired by an old Steam mod called Rabbit Rage (yes, I got permission to from the original author). Basically it makes all of the rabbits in Skyrim hostile to the player. I tweaked it a bit and gave the rabbits a teeny bit more health, about the same as a wolf, and they now have an attack radius, so you won't be swarmed by rabbits wherever you go. If you have a certain blue cat as a follower, it will unlock some interesting dialog whenever a rabbit attacks you, which is why I usually had the mod downloaded, plus the rabbit's attack language is amusing to me too. 

This is an .esl saved as an .esp so it won't take up a slot in your load order, but it can be sorted however you like. It should be put as low as possible to not interfere with anything that affects animals. I have a patch for SkyTest because I use that mod. I don't make patches for mods I don't have. If it doesn't work with a mod you have, feel free to make a patch and upload it. Otherwise, it works in my game with 400+ mods.

Obviously if you have problems with killing bunnies or your followers killing bunnies, then this mod is not for you.

Credit
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Thanks to IamPattyJack for the original mod Rabbit Rage, which you can get on Steam if you want this for the Legendary Edition.  If  you don't know how to upload a Steam mod for Mod Organizer or Vortex, Gopher has a video on YouTube that will show you how, which is how I did it back in the day.