Why Do Cats Rip Up Cardboard. Basically, this is an eating disorder that could be a consequence of dietary deficiencies or cognitive dysfunction (old age, senility), and some others. Small amounts of toilet paper will dissolve in a cat’s digestive tract.

In small quantities, this is perfectly safe. Cats may choose to shred cardboard boxes with their nails or teeth as a form of relaxation and play when they have a lot of energy. She never eats the pieces, she just rips any cardboard boxes into pieces all over the floor.