Hola! I share this animation that I made recently.
You have to bake the hair animation since it was too heavy to share.
The animal has a basic rig to move its legs and body.
It also has shape keys that served to animate the moment when it was inflated by the injection.
The blisters are animated apart and related to the bones of the animal.
I hope it helps you, if you have questions write to me. I will answer as soon as the neighbor pays for the internet.