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Hello, this is. Dr. Jess. I am sorry to hear about your dog. While we can see a pendulous abdomen with long term steroid use, I would not expect to see it happen with only a week's worth of prednisone. I would be very concerned that she could have bleeding in her abdomen or some other fluid filling the abdomen. If it is swelling and she is breathing as you describe, I would recommend taking her in the the emergency vet right away for an exam. She needs additional testing done to determine why her belly is swollen (x-ray/ultrasound) and determine the cause of her shallow breaths (could be difficult to breathe if her belly is full of fluid, or we could have bleeding or other disease in the lungs, or difficult breathing from anemia).