I have a cat that has constant nose drainage. It is so bad sometimes, he has to breath through his mouth. He sneezes but no cough. I have had him to three vets and they can not find out his problem. He has been tested for diseases and resporatory problems. All negative. He has been on antibiotics and it seems to help a little but the minute he goes off of them, it comes back. He has had this since he was born.
Could he have allergies or sinus problems? Do you have any recommendations?