Nemo has been sneezing quite a bit the last few days. I set up an appointment at the vet for him but I couldn't get in until Monday after work. He has not been outside and none of the other cats are showing any signs of anything so I am really confused about what brought this on. What can I do for him in the meantime to make him feel a little better? He isn't having any trouble breathing or anything, I can just tell he is a little under the weather. Can sneezing be a sign of something more serious other then URI's?