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I am sorry to hear about Bubba's breathing difficulties. My name is ***** ***** I am a veterinarian.
This is an emergency. The way you describe his breathing and his pale gums and mouth breathing indicate a possibly serious condition such asthma, heart failure, or a buildup of fluid in his chest. He needs a chest X-ray right away to determine what condition he has. If this were my own cat breathing like this, I would be rushing to the clinic to get him oxygen and a chest X-ray.
Please let me know how he is doing and what other questions you have. I hope you can get him to a veterinarian right away.
How is Bubba doing?
I am so sorry to hear about Bubba. My sincere condolences. When there is that much fluid in the chest, it is often cancer. I am sure it is better that he is at rest and not suffering. Thank you for letting me know.