What else should I give him?

[KikiDeAnime]

You also said he's losing weight which means he probably not eating and drink as much as he normally would,

But I watch him while he eats and drinks. I've also been giving him treats a few times since I was forced to keep him locked up away from our female ducks.

 

[Isaac 0]

Three pounds seem's pretty light for a K/C drake, how does his poop look?

 

[casportpony]

I can try, it won't be easy with how much he hates being held.
He currently weighs 3lbs, which is a pound under his normal weight.

He's lost 25% of his body weight, which is a sign he is very sick.

 

[KikiDeAnime]

Weight loss, droopiness, puffed up, these are signs of illness. Is a vet an option? What does his poop look like?

Poop is normal. He actually pooped on me when I was holding him.
Vets around us are closed.

 

[casportpony]

Yes to the puffed-up stance.
As I said in the post, he's drinking & eating fine

He's lost 25% of his body weight, something is very wrong.

 

[KikiDeAnime]

He's lost 25% of his body weight, something is very wrong.

Since he's eating & drinking fine. What else would cause weight loss?

 

[casportpony]

Poop is normal. He actually pooped on me when I was holding him.
Vets around us are closed.

No offense intended, but are you an adult? I ask because my advice to a minor will be different than my advice to an adult.

 

[BirdsBeesTrees]

Are your hen ducks the ones raising the one duckling?
Maybe you should put one of the hens back with him, he sounds depressed.

 

[KikiDeAnime]

No offense intended, but are you an adult? I ask because my advice to a minor will be different than my advice to an adult.

I'm 23 but still live with my parents

 

[casportpony]

Poop is normal. He actually pooped on me when I was holding him.
Vets around us are closed.

Please post pictures of his poop.