Weepers do count for detection. They do raise the Chaos level if they are killed. Kills by Rewired traps will contribute to your kill amounts and Chaos; that's Watchtowers, Arc Pylons, and Wall of Lights. Rats, Hagfish and River Krust do not raise Chaos if killed.

Does killing a weeper count as a kill?

Similarly, deaths resulting from a fight between guards and weepers, or thugs, are not counted as kills.

Do Wolfhounds count as kills?

Like rats, hagfish, and river krusts, wolfhounds do not count toward lethal kills in mission summaries. As such, it is possible to kill them and still achieve Clean Hands.