I live in southeast Wisconsin. Around here, I've not heard of any cougar or bobcat. I know they've been caught on camera in recent months north and northwest of here. If given a chance, wouldn't both species hunt her domestic animals? Or is that a mountain lion I'm thinking of? Here, we are absolutely infested with coyote. I've heard awful screams accompanying their pack "kill cries". I'm wondering if your 12 shepards (do you breed shepards?) Are housed together? If so, I'm not sure what kind of beast would take on a pack of twelve big dogs. You may be safe there. But it's my belief that poultry is the low hanging fruit for most predatory animals. And we all know they tend to be savvy breaking-and-entering artists! Unfortunately... Good luck to you. Try and record the sound with your phone if it happens again.You have cougar and bobcat. Cougars in heat give an eerily woman-in-distress like scream. The YouTube videos are downright chilling. Listen to one of those and compare.