i have been having insomnia ;v; can you tell, based on the weird ideas that pop into my head?
Isopod dogs (larger) & cats (smaller) clean up the environment by "eating" decaying material and any hazardous toxins or substances. Created by scientists to help clean the environment, they were released into the wild around the world to help with pollution. Some humans decided to domesticate them as well, taking them into their homes to help purify and clean around the house to reduce household waste as well! No more compost!
Their shells are built up of a flexible keratin, and the dog version are able to somewhat curl into a ball when startled or when sleeping. The cat version is more flexible, and have a longer thick tail of which they can fully curl into a tight secure ball.