Help, worms in rooster

[Farm life101]

Hello,
So we have a rooster that will squat and shake (literally) to poop. It’s been going on for about to weeks. I think it’s worms because he was never dewormed. I got safeguard equine dewormed because I heard that works but how much do I give him? He is a fully grown bantam silkie rooster which I’m unsure of his weight but I know he definitely under 5 lbs.

 

[Wyorp Rock]

How much does your rooster weigh?

Fenbendazole dosage is .23ml per pound of weight given for 5 days in a row.
Take a syringe without the needle and draw up the correct amount you need, then give that to him.
This link shows you how to administer oral medications safely
https://www.backyardchickens.com/ar...er-construction-check-back-for-updates.73335/

Can you post some photos of the poop and of your rooster?

 

[chickens really]

Is his vent plugged up with dry poop?..Possibly needs his butt trimmed a bit?..