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Not if he has never gone outside. If he has or you feed them earthworms or minnows, they can carry parasites.

Have you dewormed them with a real dewormer? I'd deworm him too. Parasites weaken their system even more. You can use Ivermectin Cattle Pour On. Not sure the breed but medium ducks I do 4, sometimes 5 drops and large ducks like Pekins 6 drops. I'd deworm them all.