Why Does My Cat Drool When I Pet Him. Dental problems are not always behind the cat’s increased drooling. It is okay to brush some cats while they are at ease, sleepy, or being hugged by humans.
A respiratory illness or a cold could also be responsible for the drooling. It merely indicates a physiologic response to happiness or extreme relaxation. Cats that have chewed on electrical cords might suffer oral burns that lead to drooling.