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Does he have any nasal or eye discharge?
I apologize. I am new to the system. Can you provide me with as much information as possible? I do not understand what you are trying to describe.
it sounds like what you are describing is a long period of exhalation that may be louder than normal. Certain conditions like feline asthma, upper respiratory tract infections, tracheal parasites or even a foreign object in his nose or throat can cause some of these symptoms.
The best way to get an answer would be to go to a vet to get the pet looked at and bring a video of an example of what he is doing so that you can show the vet.