Copper deficiency?

[Nanno]

I think herbal dewormers can be great for warding off parasites in a normal, healthy herd, but they're usually not sufficient for a goat that is already carrying a heavy worm load. Having the fecal results will tell you if he has worms, what kind, and how many. As weak as he is, he will need probiotics to go with any chemical worm treatment you give him because they can kill the good bacteria in his gut. Probios is a brand you can usually find in a feed store. I don't think another copper bolus is going help. Copper boluses are slow release so the Multimin 90 shot that Dave recommends would do a lot more for him right now. It puts the minerals right into the bloodstream. It doesn't sound like you have much hope he'll survive, but sometimes they can surprise us. Good luck!