I have worked with Alpacas quite a bit and here are a few things I have learned.
Being native to the South American highlands they are not accustomed to dealing with the intestinal parasites that are very prevalent in many parts of the U.S. (the worst place for parasites is the Southeastern U.S.). It is very important to have a parasite control plan in place from the beginning when starting to raise Camelids, as a severe infestation can cause profound anemia and even death. ( I have seen several cases of intestinal parasites that required blood transfusions)
There are exceptions but in my experience they are not terribly hardy animals, and when the become ill it can be quite serious very quickly.
They spit when they get angry.
Here is a good website with info on parasites: http://www.vetmed.wsu.edu/depts-vth/...teControl.aspx
Let me know if you have any questions about care and or health problems in Camelids.