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Hello. Welcome to JustAnswer. I am Dr Z. I'm reviewing your question now, and will post back with a reply ASAP.
Hello and thanks for trusting me to help you and Zephyr today. I am a licensed veterinarian with over 30 years of experience and would be happy work with you.
Has he been receiving lasix since the vet visit 2 weeks ago as well as the prednisolone.?
If he has an enlarged heart and fluid in his chest, the prednisone would be doing very little for that and it is likely that the lasix he received then was what helped and that it has just now built back up again to the point that he is having trouble breathing. What he most likely needs most is to get that fluid off out of his chest. Oxygen will only help so much because if he cannot expand his lungs due to the fluid, he won't be breathing that much oxygen in.
The problem with the oxygen also is administering it to him. In most cases, they do best in a oxygen cage. Cat's don't like a mask held up to their muzzle, especially if they are having a hard time breathing.
Not being able to catch his breath can lead to a lot of anxiety as well for Zephyr, which further complicates the situation. If you were able to enclose the litterbox to keep the oxygen concentration up, it may help some, but what he really needs if there is fluid in his chest again is an injection of lasix today.
The medications he received would do very little if his previous breathing problem was due to heart disease with fluid. Those are most effective if treating airway disease like asthma.
That is not usually as effective as an injection and I wouldn't want to tell you that would be OK to give as I do not know his full medical history or what his diagnosis is.
I am sorry that I am not able to provide the phone call service.
If he is open mouth breathing, this should be treated as an emergency and he should be seen tonight at an ER facility.
You are welcome. That is really the best course of action for Zephyr and cases like this should not be treated as an outpatient until he is more stable. Good luck with him.