Have you tried L-lysine? Not sure what the dosage is, but I know a fair number of people who have used it for stubborn respiratory symptoms in their cats, with (often, but not always) good results.
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"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."
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