Default "kill" for guard dogs. (Score +400; +200 if you need to knock the dog out with physical attacks first, making it the "Peasant's Death" version of Hounds Slumber)
Interestingly, despite the graphic nature of the rest of enemy Stealth Kills, your ninja shows surprising mercy and kindness to animals as he only knocks dogs unconscious.
Since the dogs are only knocked unconscious, Hound's Slumber does not let you lose your No Enemies Killed bonus at the end of the misison.