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Hi. Welcome to Just Answer. My name is***** and I've been a veterinarian for 15 years. I'm very sorry to hear about Marty's situation. I'm going to be very direct and honest here and say that when ever I heard bout a situation like this, I consider it an emergency. For him to be be slow moving and to be breathing like this, the concern arises for underlying heart issues, internal bleeding, or primary lung issues. All of these are potentially very critical. Could this be something that isn't a critical situation? That possibility is there, but I never like to take chances. I would absolutely recommend getting him to your vet immediately for an evaluation. They need to see him in person and possibly do some testing to see if this is more serious or not.
The white gums are absolutely concerning for me. I'm going to be very honest here and say that internal bleeding is a very strong concern that can look exactly like this. He could have a tumor in his abdomen that has acutely started to bleed and causing all these signs. The only way to know is to have him evaluated and most likely an x-ray of his belly. If he has a bleeding mass, then the situation becomes a surgical issue.