Thank you so much for the advice. I really really appreciate this. I'm just freaking out a *little*.

But Barney sounds like he does really well.
I'm going to ask the vet tomorrow about diet, etc, but I am more and more interested in homecooking now. We'll see, I suppose.
I'll cut out canned food, too. I wonder if I'll be able to at least mix chicken in with his kibble to get him to eat. He's never eaten kibble by itself... *sigh* I suppose if we have to, I'll just have to show him some tough love if kibble is all he can eat.
Not sure what I'm gonna do about treats... he LOVES clicker training and trick training so much, I don't want to... stop. I'm going to have to find some kind of soft small treats I can use.
I use Canz Real Meat treats right now... the venison one I have is this: Crude Protein: not less than 25%, Crude Fat: not less than 20%, crude fiber: not more than 2%, moisture: not more than 20%. Too high? I don't know how to differentiate between treats and kibble and canned guaranteed analysis' etc.
But I shouldn't even be worrying about this right now. Just wanna get him better. Will ask vet questions tomorrow....