Wiktionary
raw dog
adv. (context slang English) Without a condom; bareback. vb. (context intransitive slang English) To have sex without a condom; to bareback.
Usage examples of "raw dog".
While sojourning for a day in a camp of Sioux Indians we were informed that the warriors of the tribe were accustomed to eat raw dog to give them courage previous to going to battle.
But as raw dog was all they proposed to give to me --I had to eat it or starve.