Elf-shot

Without visible mark or sign she was elf-shot; and the proof of this appeared from her going off her milk, dwining away, and dying before her calves could be counted on the hooves of one foot.

Source: wiktionary

The malicious elves did not confine their attacks to human beings; references to elf-shot cattle are numerous.

Source: wiktionary

Frequently this practitioner would keep a stock of elf-shot from which one would be produced by sleight of hand from the ailing animal's flank as evidence that it had indeed been elf-shot.

Source: wiktionary

There, ev'ry herd, by sad experience, knows How, wing'd with Fate, their elf-shot arrows fly, When the sick ewe her summer food foregoes, Or, stretch'd on earth, the heart-smit heifers lie.

Source: wiktionary