Camelid sometimes used to guard sheep (5)

I believe the answer is:

llama

(Other definitions for llama that I've seen before include "Woolly Andean animal" , "Alpaca-like animal" , "Pack animal, native to the Andes" , "Andean beast of burden" , "mammal that chews cud" .)

I've seen this clue in The New York Times.

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