Seaweed powder…

I’ve made a bowl of food for what’s probably the world’s fussiest dog today… and he won’t eat it😭 He’s eaten lamb before, both meat and mince, and he likes sweet potato… but I suspect it’s the seaweed powder he’s reacting to… can it be replaced with something else? I find it difficult to choose a recipe because they all contain something he absolutely won’t eat, and you can’t just swap something out or leave something out, because then the nutritional content would be completely wrong again… I really want him to eat🥺 Help!