I'm glad to hear it's just asthma. Just keep in mind that even the most controlled asthmatic can have an attack that is life threatening. If possible I would try to put a little money back each month and make it an emergency fund for him in case he does have one of those attacks. Good luck...
Just b/c he's indoors doesn't mean he doesn't have heartworm. Mosquitoes get in the house plenty of times. If he was on Revolution he shouldn't have it, but that's still not 100%. I hope for your sake it's asthma or pneumonia b/c those are the only treatable things...either way he is going to...
Ok, I just have to say that just b/c it's a cat doesn't mean they don't require yearly vaccines and emergency visits!! With that off my chest....
The most likely possibilities are congestive heart failure, heartworm disease, cancer, or asthma. The only one out of the 4 that is probably...