9. Trembling, Involuntary Shaking, and Freezing

A flood of adrenaline produces visible muscle tremors, especially in the hind legs. This physiological response prepares the body for sudden physical action when a threat looms near.

Alternatively, dogs may execute a behavioral freeze, becoming entirely motionless and stiff. A freeze is a critical warning sign that the dog feels deeply threatened and may lash out if pushed.

Do not touch or crowd a dog that has frozen in place. Back away slowly and remove the trigger to prevent an escalation into defensive aggression.