All animals will have the same death animation - blood spot and a spirit leaving the body to the better world. The body will remain lying on the ground.
Pillagers and all kinds of other monsters will have their animations too. The most distinctive part of which is custom entities of dead bodies - decapitation and body parts separation included.
How to install addons:
- Download addon into your device
- Find and open .mcpack or .mcworld files that you download earlier
- Click on it to import into Minecraft Pocket Edition
- Open the game
- Create new or edit an existing world
- Scroll down to Add-ons section and select the ones you want to apply
- Make sure to enable "Experimental Gameplay"