Mad-dog

These are mad-dog times, man!

Source: wiktionary

Then she calls the cops, reports your standard mad-dog black burglar.

Source: wiktionary

All we have to do is kill the mad-dog Nicaraguan who oppresses our people, calling himself a soldier.

Source: wiktionary

And, now, these same cynical cops were being asked to shoot that dude on sight, to treat him like a mad-dog psychopath—the sanest guy in town.

Source: wiktionary