You're going to need to pen them or catch them and then worm them, in order to make sure they get the correct dosage they need.
Stop feeding them for a couple of days, they may willingly go into a pen if there is food in there, then you can close them in and do what needs to be done.
Remember to re-worm them in 10-14 days.
Stop feeding them for a couple of days, they may willingly go into a pen if there is food in there, then you can close them in and do what needs to be done.
Remember to re-worm them in 10-14 days.