My dog Biscuit has just been diagnosed with an enlarged heart and I have an appointment to take him to a pet cardiologist on Friday, the 3rd. The x-rays also showed a mass in his stomach, and that has me really concerned. He is 10 1/2 years old and has always been in good health. Having just lost his sister Lacey less than two months ago, I'm not sure how much this old heart of mind can take. Keep Biscuit in your prayers.