Llamas and donkeys are used here in Deep East Texas to protect goats and sheep from feral dogs & coyotes.
They are most effective.
A lot of folks also use the standard guard dog breeds in conjunction with the Llamas and donkeys. As long as they all grow up together, they get along great.
Llamas and horses don't mix though, based on my experience.
It's not
your experience that counts, it's the horses'.
Horses get along just fine with llamas
once they get use to them. Until then, there can be some panic by the horses which, if on a narrow trail with a string, can be a 'problem.' On occasion our neighbors will bring their horses over or, more commonly, ask our llamas to come visit so that the neighbors' horses can be acclimated to llamas.
As for guard duty... Having just spent a total of eight hours on the road to and from Yellowstone I came to realize...I seldom see guard dogs with a flock of sheep but I often llamas out in the field with them. In my part of MT it seems llamas are the much more common guard.
In any case, My Lady's three horses and six llamas share a pasture and the barn with no issues. But I've never seen them attending the same party...
FB