Barney has had a couple of respiratory infections over the years. I usually just take him in the bathroom and let him breath in some steam over the bathroom sink (careful not to burn). This opens him up but does not use menthol or anything else. I do it for a couple of minutes a few times a day and it usually stops the bronchial spasms he gets (he has reverse sneezing so tends to honk and spasm when he has a cold).
Good luck!
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