Creating fencing/shelter to keep out coyote

We recently sold some fiber males to new owners. They took the animals home only to find out that in their area there is a very aggressive pack of coyotes. This pack visited the new herd for two nights and finally, the new owner asked if she could return the animals to our Ranch because she was very afraid that the animals were in a threatening situation.

Does anyone have any recommendations for fencing that might make the 4 alpacas less interesting to the coyotes? I have found that if there is prey that is easier to hunt, the coyotes will soon tire of trying to get at the alpacas. They cannot have guard dogs in the area they live and the space is a little bit limited for a llama. Any other thoughts?