It would go away for a bit and come back. It never went away completely but it would just happen every now and then and have a flare up. He would go through a random week where he would sneeze a bit. But he never coughed or had any other issues. He was about 14 when he passed which isn't bad for a regular outdoor cat. At the end he got pancreatitis and his organs started to go. We made him as comfortable as possible. The vet may have said it could have been related to his FIV. It let was a while ago now. Everyone in the block loved Ferris, he was a kitty celebrity.