When a cat has a stuffy nose, it is most often due to an upper-respiratory infection. In most instances, an upper-respiratory infection in a cat is equivalent to a common cold in people. This kind of infection can be treated safely at home, unless the cat doesn't respond to the treatment or unless the animal's symptoms become worse.
Keeping a cat's nose clean is a primary concern if your cat has an infection. Gently wipe the cat's nose with a warm, moist washcloth. Ensure you remove fresh mucus as well as any dried crusts.
Place a dab of petroleum jelly on the end of the cat's nose if it becomes chapped or dry. Repeat this process at least twice each day until the stuffy nose resolves. Place your cat in a humid environment to help to break up the mucus in her nose and help her recover from her upper-respiratory infection more quickly.
If you have a humidifier, place it in the room where your cat most often sleeps. If you do not have a humidifier, run a hot shower and place you cat in ... more.