When ever I go near a bunny it says "Minecraft Not Responding"

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
It to let me near bunnies.
What actually happened was...:
Describe what happened here
It didn't let me near bunnies.
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... Go up to or spawn a bunny
3. ...Walk towards it or stand still