Cats that inhale formaldehyde will experience symptoms such as low spirits, lethargy, inactivity, and painful calls. Formaldehyde is a toxic substance. When cats inhale it, it will irritate the mucous membranes, cause respiratory discomfort, and in severe cases, cause liver damage or cause Cats have respiratory poisoning, so it is best not to let cats come into contact with formaldehyde. If formaldehyde is used at home, cats must be kept in isolation.