We got good news today after the Ultrasound and x-rays. At this time, there is only mild mitral value degeneration and the heart is not enlarged. The cardiologist said could do x-ray recheck in a few months, but looks good for now. I asked if it was due to diet or some other care issue, the doc said no, it happens in some dogs (and people too) as they age. Again, thank you all for your kind thoughts and prayers.