Q. Hello, my male Siamese has suddenly has been more lethargic,stopped meowing,and has noisy breathing on expiration and gags once in awhile.
A. It sounds like your pet has an upper respiratory infection. I recommend getting him in to see your vet for an exam and possibly a prescription for antibiotics to help him recover faster.
You might consider adding lysine to your petâ€™s food as an immune booster, at least for the duration of the cold. Http://bit.ly/1CBaNSX
Something that can be helpful is shutting your pet in the bathroom with you when you shower. The steam will help the nasal passages stay moist and help clear the mucous buildup.