Guard Llamas love peace and quiet, and good, tilled earth. They dress in
bright colours, being notably fond of yellow and green; but they seldom wear shoes, since their feet have tough leathery soles. They are fond of simple jests, and six meals a day, when they can get them.
Oh, wait. That's hobbits.
Guard llamas have something in common with hobbits, it turns out, what with the leathery-soled feet and fondness for six meals a day. And, there is a lot of misinformation floating around the internets about llamas as guards, not least of which is the correct spelling of 'guard'.
While there are many llamas who are gainfully employed as guardians of sheep, goats, alpacas, and other animals, not every llama is suited to the task. Intact males, for example, are not a good choice for smaller livestock. In the event that they act on the instinct which makes them so territorial, (i.e. breeding) it generally doesn't go well for the animal being "guarded".
Young llamas need to mature and figure out their place in the world before they are left in charge of a group of other animals. A llama should be at least two years old before they are expected to live with another species away from other llamas.
It's important to remember that llamas are prey animals, and while they can and do chase away (and sometimes kill) coyotes and dogs, a llama is no match for a pack of canines, a mountain lion, or a bear. The best defense against that kind of threat is good fencing, and putting the animals in the barn in the evenings.
an alarm call (like a cross between a horse's whinny and Curly of the Three Stooges going nyuk nyuk nyuk) (That's how it sounds to me anyway)
It's worthwhile to check out what the llama is alarmed about. Once, I heard some of my boys alarming and looking toward the south. There was a bald eagle there in the pasture chowing on a prairie dog (TEAM EAGLE!!) It was a cool sight, and I probably wouldn't have seen it without the llama alert.