I'm comparing this recent picture, to previous ones you posted. In this pic, Brandy's peri- orbital area, around the eyes, looks a little puffy. Thinking some kidney problem. Qr possibly congestive heart failure. Maybe even a pericardium inflammation, the sac around the heart. It would cause occasional gagging, maybe cough, excessive yawning maybe, lethargy and less eating/poor appetite.
I would think though, that the vet has checked her heart sounds and xray of her heart for increased size.
