@jespah,
They gave him homemade food. Also, I've tried being strict by refusing to give him human food, just puppy food. He didn't eat for 3 days until I finally gave in and gave him some human food ( he was starving!).
I've tried the following:
mixing puppy food with water
mixing puppy food with human food
putting puppy food in different sized bowls
putting puppy food on floor
taking away puppy food if he does not eat
leaving puppy food in bowl all day
trying different brands of puppy food
trying puppy treats