Переноска стояла у двери, но котёнок так и не захотел в неё залезть.

Here переноска means a pet carrier or carrying case, the kind you put an animal in for transport.

A few useful notes:

• It is a feminine noun.
• It comes from the idea of carrying / transporting something.
• In different contexts, переноска can also mean other portable things, but in a sentence with котёнок, it very naturally means a cat carrier.

Russian often uses verbs like стоять (to stand), лежать (to lie), and висеть (to hang) where English would simply say was.

So:

• Переноска стояла у двери = literally The carrier was standing by the door
• Natural English: The carrier was by the door

This is very normal in Russian. Objects are often described according to position:

• Книга лежала на столе = The book was lying on the table
• Стул стоял у окна = The chair was by the window

So стояла is not strange here at all.

У normally requires the genitive case, so дверь changes to двери.

• dictionary form: дверь
• after у: у двери

Here у двери means by the door / near the door.

This is a very common pattern:

• у окна = by the window
• у дома = by the house
• у стола = by the table

So the important point is: у + genitive.

Котёнок is a masculine noun in Russian, even though it means kitten and the actual animal could be male or female.

Because it is grammatically masculine, the past-tense verb agrees with it:

• котёнок захотел

If the subject were a feminine noun, the verb would change:

• кошка захотела

So захотел is masculine singular past tense, agreeing with котёнок.

Так и не is a very common Russian pattern that adds emphasis. It means something like:

• never did
• still didn’t
• just wouldn’t
• in the end did not

So:

• котёнок так и не захотел в неё залезть

suggests not just the kitten didn’t want to climb in, but more like:

• the kitten just wouldn’t climb into it
• the kitten still refused to climb into it
• the kitten never did want to climb into it

This construction often implies that maybe someone expected it to happen, or kept hoping it would happen, but it didn’t.

Examples:

• Я так и не понял = I never did understand
• Он так и не пришёл = He never showed up / He still didn’t come

These mean slightly different things.

• не залез = didn’t climb in
• не захотел залезть = didn’t want to climb in / refused to climb in

So the sentence focuses on the kitten’s unwillingness, not just the fact that the action failed to happen.

Adding так и не strengthens that idea even more:

• так и не захотел = just never wanted to / wouldn’t

So this is about attitude or willingness, not merely the result.

Because залезть expresses motion into something, Russian uses в + accusative.

• в неё = into it
• в ней would mean in it as location, not movement

Compare:

• Он залез в коробку = He climbed into the box
• Он сидит в коробке = He is sitting in the box

So here:

• залезть в неё = to climb into it

not

• в ней = in it

because the sentence is about movement toward the inside.

After many prepositions, Russian personal pronouns beginning with е- get an extra н-.

So:

• её = her / it
• but after a preposition: в неё, у неё, для неё

This is a standard rule:

• к нему
• с ней
• у них

So в неё is exactly what you should expect after the preposition в.

Залезть means something like:

• to climb into
• to crawl into
• to get oneself into

It often suggests entering a place that is somewhat enclosed, tight, awkward, or that requires a bit of scrambling.

That makes it a very natural choice for a kitten getting into a carrier.

A verb like войти would sound more like walk in / enter, which does not fit as well for a small animal getting into a carrier.

So залезть gives a more vivid and natural image.

Залезть is perfective, while залезать is imperfective.

After захотел (wanted), Russian often uses the perfective infinitive when talking about wanting to perform a single completed action:

• захотел залезть = wanted to climb in

This fits the situation well, because the idea is a one-time action: getting into the carrier.

If you used залезать, it would sound more like an ongoing or repeated process, which is less natural here.

Both orders are possible. Russian word order is flexible.

• не захотел в неё залезть
• не захотел залезть в неё

Both are grammatical.

In this sentence, в неё comes before залезть quite naturally, partly because Russian often places short prepositional phrases before the infinitive, and partly because it keeps the reference to the carrier close and easy to process.

So this is more about natural flow than a hard grammar rule.

Но means but, and it sets up a contrast:

• the carrier was there, ready by the door
• but the kitten still refused to climb into it

So the sentence has a clear contrast between the situation being prepared and the expected action not happening.

This works especially well with так и не, which reinforces the sense of frustrated expectation.