My little sister and I were in the elevator when a strange dog suddenly leapt toward her, paws on her chest, barking wildly — and what we later learned chilled us to the bone.

It’s been nearly five years. I’m in college now, but that moment has never left me. Only today do I finally feel ready to tell the story.

It started like any other day. After school, we walked home together, laughing, sharing what had happened that day. We live on the top floor of an apartment building, so we stepped into the elevator as usual.

A few floors down, the doors opened and a man in his mid-30s entered with a big, light-colored Labrador.

We’ve always loved dogs, so my sister’s face lit up. She reached out to pet him — and then everything shifted.

The dog froze, locked eyes on her, and in one sudden motion stood up on his hind legs, pressing his paws against her.

She screamed, trembling, while I stood frozen in fear.

The Labrador then erupted into sharp, urgent barking.

The man tightened the leash, crouched beside the dog, and reassured us.