My dog is named Maxwell
and he's had the same issues as you have with your Max. I've switched foods numerous of times since he was a puppy. I guess mine gets tired of the same food and wants something different. But this has happened when he is 1/3-1/2 or more thru a bag. Honestly, mine has been on 8+ foods including wet mixed with dry. Try some wet food, a teaspoon and mix it good and see if that will help. I am going thru this once again as we speak and he is 2 years old now. The Vet told me not to change foods and when he is hungry enough, he will eat. He hardly ate this weekend and I got some wet as I mentioned. He ate it one day with his dry and wouldn't the next. Tonight I got some "Chef Michael's" and mixed a bit in his dry food (Royal Cainine) and he was happy and ate a good amount. Royal Cainine is for picky eaters, supposily. I am about to post something about this about my Maxwell and saw your posting. Good Luck