zack didn't like any kibble, he would eat eventually if i left the food there, after hours, he'd eat it, but reluctantly. I think part of the problem has been that most kibbles have big pieces and he's had trouble chewing them up, he has to take it to the carpet, lay down and chew up once piece at a time. I also tried several seemingly appetizing canned foods, Wellness, various flavors, Canadae, Merrick's Grammy's Pot Pie, but he was not interested in those either and i couldn't leave them in the bowl, they'd spoil.
I just happened to try Innova Evo kibble and he, for some reason, actually acts like he likes it. It's higher protein than the other kibbles i tried, almost twice as much. Maybe that's why. Aaron said that this makes Evo more like cat food (i think) so that could explain why he actually seems to like it. He definitely likes the cat's kibble, which i have to guard and keep away from him.
Evo also comes in small easy to chew pieces.
If you haven't tried it, it might be worth a try (Innova Evo).