Don’t buy animals that show signs of having resistant parasites If you do purchase – aggressively treat for parasites and quarantine them in a dry lot for 21-30 days. Treat them with three different classes of dewormers.
Be leery of buying animals from a general sale where you don't know anything about the history of the animal.
Question the breeder concerning what their parasite management is. Many breeders worm on a regular basis whether the animal needed it or not. They may not test to see if their dewormer was effective. This can result in your buying a goat that has just been dewormed having a ton of super worms.
Some breeders that show animals or have kids showing in 4H/FFA may be worming every 3 weeks regardless of the worm status. This can create super worms that nothing can kill and it is not difficult for those worms to be passed on to the general herd.