...Regarding his early onset of DCM/CHF his cardiologist only mentioned that it is somewhat unusual, and that she thinks that probably he is homozygous for the gene to have developed so early. I have not have him tested for this, since I do not see the point at this time.
First, let me say how sorry I am.
I lost my best red boy ever, at only age three, to this same nightmare disease.
Regarding what I pulled out of your post, there: Please consider having him tested, for the purposes of Dr. Meurs' research.
If that test had been available when my Ezra was diagnosed, I would have loved to have had him tested, just to see if the homozygous thing held true. I know it's a prevailing theory right now, but would hope to see more data on this.
As far as supplements, I guess do whatever feels right to you, with the guidance and support of his tx team.
I know, looking back, that one of the things I ended up regretting is being so terribly focused on getting tons of meds and supplements down my boy...when ultimately it did not change a thing and that was precious time I coulda been letting him chew his favorite stuffy, playing tug with him, or just sitting quietly with him by the creek. Just something for you to ponder.
As far as eating--it is so difficult to keep them eating when they feel so uncomfortable from the CHF.
Feeding him while he's standing, in an elevated position, may help him feel comfortable enough to eat more.
I wouldn't stress overly much over what you get in him, at this point--others may disagree, but I feel let him eat what he wants, even if it's "junk" food to a certain extent. My guy got lots of extras and special things, at the end.