What signs do dogs look for when they sense fear in humans? facial expression, sweat, posture?

dogs dont attack when your scared- they attack when there owner is scared and when the dog themself is scared- they read your muscle tension- see when dogs are about to fight, they tense up and the other dog senses that and attacks, when you feel depressed they feel that and react the same way. that dog has rabies is what it sounds like, or its naturally protective.