Dogs have an instinct to protect the people they love, and their keen memory ensures that frightening experiences rarely fade.

When a scary moment occurs, they may carry it with them for years, always alert and ready to prevent it from happening again.

That’s exactly what unfolded with Charlie, a California dog, who was startled by a smoke alarm years ago. How he still reacts to that memory today amazes his owner.

A Nervous Watcher

It all began on a typical day when Tracy Hall was at home with Charlie .

She popped a slice of pizza into the oven, unaware that this simple act would set off a chain of events Charlie would never forget.

Some cheese melted and dripped onto the oven bottom, creating smoke that triggered the alarm . The piercing sound terrified Charlie, who immediately

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