La nuit, le chiot dort dans sa niche, à moins qu’il n’entende un bruit dans le jardin.

La nuit is a common time expression meaning at night or during the night.

French often puts this kind of time phrase at the beginning of the sentence to set the scene:

• La nuit, le chiot dort... = At night, the puppy sleeps...

You could also say Pendant la nuit, but La nuit is shorter and more natural in many everyday contexts.

Chiot means puppy, while chien means dog.

So:

• le chiot = the puppy
• le chien = the dog

French often uses a more specific noun when it matters, just like English does.

Because niche is a feminine noun in French:

• une niche = a kennel / doghouse

The possessive adjective has to agree with the thing possessed, not with the owner.

So:

• sa niche = his/her/its kennel

Even though the puppy might be male, French still uses sa because niche is feminine.

Compare:

• son panier = his/her/its basket (panier is masculine)
• sa niche = his/her/its kennel (niche is feminine)

Here, niche means a doghouse or kennel.

It can also mean a niche in other contexts, like a recessed space in a wall, but in this sentence, because we are talking about a puppy, it clearly means the place where the puppy sleeps.

À moins que means unless.

So this part:

• à moins qu’il n’entende un bruit
  means
• unless he hears a noise

It introduces an exception:

• normally, the puppy sleeps in his kennel
• except if / unless he hears something in the garden

French avoids putting que directly before il without contraction.

So:

• que il → qu’il

This is called elision: the final vowel drops before a word beginning with a vowel sound.

You see this often in French:

• que il → qu’il
• je ai → j’ai
• ne entende → n’entende

Because à moins que is normally followed by the subjunctive.

The verb here is entendre. In the present subjunctive, with il, it becomes:

• qu’il entende

Not:

• qu’il entend (that would be indicative)

So the structure is:

• à moins que + subjunctive

Examples:

• à moins qu’il vienne = unless he comes
• à moins qu’elle soit malade = unless she is sick
• à moins qu’il entende un bruit = unless he hears a noise

This is a very common learner question.

The ne here is called an expletive ne. It does not make the sentence negative.

After expressions like à moins que, French often uses this extra ne in formal or careful language:

• à moins qu’il n’entende un bruit

This still means:

• unless he hears a noise

It does not mean:

• unless he does not hear a noise

So in this sentence, the ne is grammatical/stylistic, not truly negative.

You may also hear or see:

• à moins qu’il entende un bruit

That is also understandable, especially in less formal French.

No, not here.

A true negative in French usually has ne ... pas, ne ... jamais, ne ... rien, etc.

For example:

• il n’entend pas = he does not hear
• il n’entend rien = he hears nothing

But in your sentence, there is only ne, and it appears after à moins que, where it is often expletive and not negative.

So:

• à moins qu’il n’entende un bruit = unless he hears a noise

In French, countable nouns usually need an article.

Bruit means noise or sound, and here it is one unspecified noise:

• un bruit = a noise / a sound

You normally would not say just entendre bruit in standard French.

Dans le jardin means in the garden.

• dans = in / inside
• le jardin = the garden

French uses dans for location inside an area or space. Here it tells you where the noise is coming from.

So:

• un bruit dans le jardin = a noise in the garden

The commas help separate the sentence into clear parts:

• La nuit, = time setting
• le chiot dort dans sa niche, = main statement
• à moins qu’il n’entende un bruit dans le jardin. = exception

They make the sentence easier to read and reflect its structure. The first comma after La nuit is especially common because that opening phrase sets the time for the whole sentence.

Yes. French allows some variation.

For example, you could say:

• Le chiot dort dans sa niche la nuit, à moins qu’il n’entende un bruit dans le jardin.

That still means the same thing.

But starting with La nuit sounds natural because it emphasizes when this usually happens.

Dort is the present tense of dormir:

• il dort = he sleeps / he is sleeping

In this sentence, the present tense expresses a habitual action:

• La nuit, le chiot dort dans sa niche
  = At night, the puppy sleeps in his kennel

It is not just happening right now; it describes what the puppy usually does.

Yes, it could be elle if the puppy were female.

French personal pronouns agree with the animal’s grammatical/real gender in context:

• qu’il n’entende = unless he/it hears
• qu’elle n’entende = unless she/it hears

Since the sentence uses le chiot, it naturally continues with il.

Yes, in standard French, à moins que is followed by the subjunctive.

Examples:

• à moins qu’il pleuve = unless it rains
• à moins qu’elle ne parte = unless she leaves
• à moins qu’ils soient en retard = unless they are late

So your sentence follows a very important grammar pattern:

• à moins que + subjunctive

Entendre can sometimes mean to hear, and in some contexts to mean or to understand something in a broader sense. But here the context makes it clear that it means to hear:

• a puppy
• a noise
• in the garden

So:

• entendre un bruit = to hear a noise

That is the natural meaning in this sentence.