Everyone had offered great advice and I will just add that Georgie was the same way. From his first day home he had boiled chicken and he is 7 1/2 and still gets boiled chicken once a day. The good thing is...he eats his kibble and since he he is so small we boil 5 tenders and it last him the week! I don't think you have to add several different toppers to his food it's just finding what he likes. Georgie likes plain Greek yogurt so we add that and a little chicken with 1 meal and he's good to go
It will all work I am sure of it!