日本語
The Dog That Did Not Bark (illustration)
FILE No.85Unsolved

The Dog That Did Not Bark

Difficulty ★☆☆about 4 minEveryday MysteryThe silent dogSomeone familiar
Jewels stolen at night, yet the guard dog never barked. What does that tell us?

Case Record

In the middle of the night, jewels were stolen from a safe in a country house. In the garden was a guard dog that barks at every stranger who comes onto the grounds. Yet the servants say they did not hear the dog even once that night.

The dog was in good health the next morning. There was no sign it had been given a sleeping drug or poison, and there were paw prints showing it had been walking around the garden during the night.

Your question

What can we conclude about the culprit?

Case Files

Evidence

Diagram

Night to morningItemObservationBarked?Not even onceAsleep?No (paw prints in the garden)Drugged or poisoned?No signA stranger would have made it bark.
Diagram

Timeline

  1. The jewels are stolen.
  2. The dog did not bark.

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

Was the dog asleep?

Open hint 2

Does a dog bark at strangers?

Open hint 3

What does it mean that the dog stayed quiet?

Solve It

Your question

What can we conclude about the culprit?

Choose the answer closest to the truth.

Share: I'm solving this

The Truth

Someone the dog knew well, a member of the household

The answer is: someone the dog knew well, a member of the household.

The dog was not drugged and was awake in the garden. A stranger would have made it bark, and it did not. So the culprit was someone the dog knew and was used to, probably a member of the household.

Sometimes what did not happen is as important a clue as what did.

What the silence meansThe dog was awake and wellIt barks at strangersIt did not bark, so the culprit was someone it knew
Diagram of the solution

Key Points

  • What did not happen can be a clue too
  • Use the fact that the dog was not drugged
  • Think about who the dog is used to

Why people get fooled

We focus on what happened and overlook what failed to happen.

Similar tricks

  • The notice-the-absence type
  • The elimination type

If you like this file, try these

A Sixty-Four Player Tournament (illustration)A Sixty-Four Player Tournament★☆☆about 3 minThe Diagonal of a 3 by 4 Room (illustration)The Diagonal of a 3 by 4 Room★☆☆about 4 minThe Clock in the Mirror (illustration)The Clock in the Mirror★☆☆about 3 minThe Four-Lamp Code (illustration)The Four-Lamp Code★☆☆about 4 min

If you view the truth, this case will not count as solved on your own. Open it anyway?

Privacy Policy (Japanese)

The cases on this site are fictional puzzles created for entertainment. Any resemblance to real people, organizations or events is coincidental.

© Unsolved Files