Help Sick goose

[SnakierDart360]

My goose (male) is suddenly making no noise, doesn't hang out with his flock and doesn't alert when unknowns are around anymore.

He just wanders off to somewhere and stands or lays in sleep pose. Doesn't respond to his name or even try to walk away from me, the dog or anyone like usual, he'll just sit there and allow whatever near him.

I just started monitoring him and he's pooping green mucus (no worms) and not much more. The green is regular the amount and the mucus is not. I haven't seen him eat yet but I'll update

I'm currently looking up anything else it could be

 

[Goosebaby]

How is your goose?

Is he still eating? What’s his body condition, does his keel feel like it’s jutting out sharply from his chest? How long has he been like this? Has he been chewing on anything with peeling paint or galvanized metal? Could he have swallowed any buts of metal?

Also what feed is he on?
Is a vet an option?