Here's why:
* Digestive Issues: Cardboard is not digestible for guinea pigs. It can cause blockages in their digestive system, leading to serious health problems.
* Toxic Materials: Cardboard can be treated with chemicals, inks, and glues that are toxic to guinea pigs.
* Lack of Nutritional Value: Cardboard offers no nutritional value for guinea pigs. They need a diet rich in hay, fresh vegetables, and a small amount of pellets.
Instead of cardboard, provide your guinea pigs with safe and appropriate chew toys:
* Hay: Timothy hay is their primary food source and provides great chewing opportunities.
* Wooden chew toys: Look for safe, untreated wood toys specifically designed for small animals.
* Grass mats: These are a great way to provide a natural chewing experience.
* Paper-based chew toys: Some paper-based toys, like cardboard tubes specifically made for guinea pigs, are safe and digestible.
Always supervise your guinea pigs when they are chewing and ensure they are not ingesting any harmful materials.