Phenols are caustic, poisonous, acidic compounds.
These compounds cause constant irritation to the nasal passages, throat, and lungs of small animals giving bacteria an easy opening, thus commonly causing pneumonia. Phenols also affect organs such as the liver and kidneys, because these organs are responsible for filtering toxins out of the body. When presented with a large amount of toxins over time, they are unable to filter it all out and begin to fail. An animal with a damaged liver will have a depressed immune system, which can lead to other medical conditions. Fortunately there are a number of good products on the market which take the place of traditional bedding.