He also has a severe left atrial enlargement due to the mitral valve regurgitation. He is on vetmedin and I have him on the following supplements: coq10, l-carnitine, vitamin c and magnesium. I usually feed him raw beef or cooked chicken hearts. He also likes cauliflower (cooked) and advocado. I will try the flaxseed oil and taurine and maybe drop the magnesium or vitamin C. I keep my house at 80 during the day, but at 77 or even 76 at night. He seems to do better in cooler temperatures. But I have an old AC and don't want to tax it too much this summer so I have an extra window unit in my bedroom and he stays there a fair amount during the day. Any additional suggestions are appreciated.