Author: Melissa / Source: Today I Found Out
Kiaan D. asks: Why do you say “sic him” to dogs when you want them to attack someone?

People have been telling dogs to “sic ’em,” with the intent to have the dog attack individual(s), since at least the nineteenth century. While this may seem odd given common modern definitions for “sick” or the variant “sic,” at the time this command popped up, it made perfect sense.
“Sick,” in this context, had nothing to do with the word meaning “ill,” but rather was simply a dialectal variant of “seek,” which used to sometimes carry the connotation of seeking with the intent to attack. (This sense of the word “seek” was used as far back as around AD 1000 in the work, Beowulf.)
The first known instance of someone instructing a dog to attack someone using this “sick” command occurred in Johnson J. Hooper’s 1845 Adventures of Capt. Simon Suggs:
You may well say that: what I tells them to do they do—and if I was to sick them on your old hoss yonder, they’d eat him up afore you could say Jack Roberson. And it’s jist what I shall do, if you try to pry into my consarns…
And later in that same work,
“Here, Bull!” shouted the widow, “sick him, Pomp!” but we cantered off, unwounded, fortunately, by the fangs of Bull and Pomp, who kept up the chase as long as they could hear the cheering voice of their mistress—“Si-c-k, Pomp—sick, sick, si-c-k him, Bull—suboy! suboy! suboy!”
As to how that became such a popular way to tell a dog to attack, rather than…
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