No ,he is not fussy,, he will eat anything,,, Begs nonstop! But he will always go back to the dog food! So sorry cant really help ya,, have you tried diffrent brands of food? I always fed Bailey Eukanuba then my neighbor gave me some Science diet (cause her dog wouldn't eat it) and he pratically inhaled it,,then I was worried he wouldnt eat his old food, but he did.
ALso that Iams gravy stuff that ya put on their food,, it has alot of vitamins and good stuff in it,,, it really looks and smells like gravy,, another friend gave me that (cause their dog wouldnt eat it) and again he inhaled that,, I just used a drop or so,, and he would eat the entire bowl,, even though I know only a few pieces had the gravy on it.. Might try that stuff. Good luck.