Here's why:
* Pine and cedar wood contain phenols, which are aromatic compounds that can be toxic to guinea pigs, especially in the long term.
* These toxins can cause respiratory problems, irritation, and even liver damage.
* Even if you can't smell the strong odor, the phenols are still present.
Safe bedding options for guinea pigs include:
* Aspen shavings: A good, affordable choice, but make sure it's dust-free.
* Timothy hay: A great option, as guinea pigs can eat it as well as use it for bedding.
* Paper bedding: A good choice for sensitive guinea pigs, but make sure it's made from recycled paper and is dust-free.
* Fleece liners: Reusable and washable, but may require additional bedding for burrowing and absorbing urine.
Always err on the side of caution and choose a bedding material that's safe and comfortable for your guinea pig.