I haven't kept up with dog foods lately because I have been sticking to what works for us: Fromm 4 Star Nutritionals. My guys eat the Chicken a la Veg.
When you leave kibble down, toss it at the end of the day. Kibble spoils, especially the better dog foods that have fewer preservatives. My guys won't touch kibble that his been in their bowls for more than 8 hours, and my one boy turns up his nose when we get to the bottom of a bag. I have to open a fresh bag so that he will eat.
What does your boy eat?