Many people keep goats and sheep with alpacas. It can be done but it can make parasite management more complicated. If new goats are coming to the farm they should be tested for CL (caseous lymphaditis). It is quite contagious and can be very difficult to get rid of since it survives on surfaces for years.
Barber pole worm is also becoming a big problem, especially in warmer climates. It has become very resistant to most worming medications.
If you live in white tail deer country (or your hay comes from fields that have white tail deer) the alpacas need to be treated with 1% Ivomec injected SQ (under the skin) at a rate of 1cc/100 pounds every month.
Oral Ivermectin horse dewormer will not kill meningeal worm. Meningeal worm will never become resistant to the Ivomec because the alpaca is a dead-end host, but the monthly Ivomec injections will cause other parasites in the alpaca to become resistant to ivermectins, and this can cause problems for other livestock. Basically, it makes ivermectin dewormers useless on your farm for anything but meningeal worm.
Alpacas are more susceptible to parasites than goats and sheep. A parasite load that is not a problem for goats or sheep will cause problems for an alpaca.
Resistant parasites in goats, sheep, and alpacas have become a real problem in recent years. Please do not blindly "deworm on a regular basis" (with the exception of meningeal worm). Deworm individual animals as required based on fecal tests, and concentrate on prevention through cleanliness and pasture management.
Fiber is usually carded before spinning. For small amounts, you can use inexpensive hand carders. Drum carders make it easier to process larger amounts. I have seen experienced spinners "spin from the fold" using uncarded fiber. If the staple length is long enough, they simply fold the fiber in half as they feed the spinning wheel. Pretty cool, but these were people with years of spinning experience.
As far as misinformation goes, most of the reference is to the perception that alpacas are valuable animals, that their fleece is valuable, and that it is easy to make a quick buck selling the babies. Yes, some alpacas are valuable - just like any well bred livestock - but we are seeing more and more alpacas is rescue situations because new owners realize that they can't sell the offspring or don't understand some of the special requirements of caring for alpacas. Raw alpaca fleece can be had for $10/pound (or less), with a single animal producing maybe 3 or 4 pounds per year. That doesn't cover the cost of upkeep, and is the reason there are so many unwanted males. Like most other livestock, alpacas have a wide range of personalities. Some make good pets and some are a real pain to deal with.
The person who sold Preston (the alpaca that started this discussion) was, in my opinion, irresponsible. First, he sold a single alpaca (a herd animal) to a person who was not prepared - although for Preston's sake he seems to have found a loving home. He provided no information on how to care for alpacas. He provided no medical records. He did not shear the animal this year. Preston must have really suffered in the heat of the summer. Judging from the picture Preston has either fiber rot (from standing in water or mud trying to cool off) or mange on his lower legs. There should be fiber right down to his toes.
Please don't get me wrong - it's great that people have an interest in keeping alpacas and using the fiber. It can be a real joy to have them around. But realize that they have special nutritional and health requirements compared to other livestock, that they need the companionship of other alpacas, and that good gelded fiber boys are available for free, or nearly so.
Best Regards - Jeff