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Hi, I can help you with your question today. How long ago was Skippy's last physical exam?
OK. I am concerned about the possibility of heart disease causing his signs. This can be a cause of decreased exercise tolerance and increased respiratory effort.
I recommend having him evaluated by your regular vet. I would start with a physical exam and x-ray of his chest.
These may be enough to diagnose heart disease. If we confirm it, we can then begin medications which should improve his condition significantly.
Please let me know if you have further questions. I am happy to continue until I provide the service that you seek.