British Shorthair's question about Dilated Cardiomyopathy

Question

I have a 7 month old British Shorthair with DCM. The cardiologist diagnosed him when he was 5 months old. I took him in after I saw that he would pant after minimal exercise. All four chambers of his heart are enlarged with left and right systolic dysfunction. No mitral valve regurgitation. Taurine levels in blood came back normal. I don’t know what his prognosis is, I was just told that it’s a progressive condition. His health seems to go and down. He was eating less than usual and they said it could possibly be the profession of his condition, cardiac cachexeria. After appetite stimulants were given, he has been better. His coat has started to lighten in spots and I’m not sure if that could be related.

Dilated Cardiomyopathy in Cats