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Hi Trinity, it’s hard to be certain what you saw from your description. Video clips in these cases are the most helpful I find. I will venture to say that the most common cause of strained breathing in an otherwise apparently healthy cat is an asthmatic cough. Below is a video link to a cat having an asthma cough. See if this is similar to what you saw and I can try to provide some more insight for you: https://www.youtube.com/watch?v=I5iC510LmuI