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I understand that he appeared healthy 4 months ago, but during that exam and those tests he also wasn't showing any signs of being sick. Now that he appears ill at home, it is very likely we will find different results on those tests.
I highly recommend having her evaluated by your local vet. I would start with a physical exam and x-ray of his chest. I'm concerned about the possibility of congestive heart failure. If that is confirmed, we can use several medications to control these signs, including furosemide, enalapril and Vetmedin.