I expect I'm being hyper sensitive, having lived this for so long. But believe me, when you are watching your animal starve themselves to death, you let them eat whatever their hearts desire. I used to do research into my horse's feed just like we do for dogs and feed him only the best. These days, if he wanted Twinkies and Ho-Hos every day, he would get that.
Not to be too rude, but don't even start to criticize until you've been there. I was feeding ice cream, chips, pretzels, cheese, and other junk to my cat to get him to eat something.
Puppy, I have no suggestions - only hugs and support. <3