A fire can cause a lot of smoke. In the smoke there are a lot of powerful chemicals that can do damage to lungs. These chemicals include carbon monoxide, formaldehyde, benzene, and acrolein. There is also a lot of soot that can clog the lungs preventing your pet from breathing. Even if your pet seems fine after any type of smoke inhalation, it is crucial to have them checked out immediately since it can take hours or days to cause problems.