Для поездки к ветеринару мы взяли переноску, потому что кошка боится машины.

Because для requires the genitive case.

• поездка = nominative singular
• поездки = genitive singular

So:

• для поездки = for the trip

This is a very common pattern in Russian:

• для работы = for work
• для друга = for a friend
• для школы = for school

So after для, you should expect the next noun to be in the genitive.

Because к takes the dative case and means to / toward someone or something.

• ветеринар = nominative
• ветеринару = dative

So:

• к ветеринару = to the veterinarian

This is the normal pattern:

• к врачу = to the doctor
• к другу = to a friend
• к маме = to Mom

In this sentence, поездка к ветеринару means a trip to the vet.

Взяли is the perfective past of взять, while брали is the imperfective past of брать.

Here, взяли is used because the sentence describes a completed action:

• мы взяли переноску = we took/brought the carrier

The idea is that, for this particular trip, they took the carrier once as a complete action.

Compare:

• Мы взяли переноску. = We took the carrier.
• Мы брали переноску каждый раз. = We used to take the carrier every time.

So the perfective verb fits because this is one specific finished event.

Because переноску is the accusative case, and it is the direct object of взяли.

• переноска = nominative
• переноску = accusative

Since they took something, that thing goes in the accusative:

• взяли переноску = took the carrier

This is very common with transitive verbs:

• читать книгу = to read a book
• купить машину = to buy a car
• взять сумку = to take a bag

Here переноска means a pet carrier, the box or carrier used to transport an animal.

The word comes from the idea of carrying something. In different contexts, переноска can also mean other portable/carrying-related things, but in a sentence about going to the vet and a cat being afraid of the car, it clearly means a cat carrier / pet carrier.

So a learner should understand it as a practical vocabulary item often used with pets.

Yes. Потому что is a very common conjunction meaning because.

You should usually treat it as a fixed expression introducing a reason:

• Мы взяли переноску, потому что кошка боится машины.
• We took the carrier because the cat is afraid of the car.

It links the main clause to the explanation.

A learner may notice that Russian also has потому by itself in some contexts, but in sentences like this, потому что is the standard way to say because.

Because the verb бояться usually takes the genitive case, not the accusative.

So:

• машина = nominative
• машины = genitive singular

Therefore:

• кошка боится машины = the cat is afraid of the car

This is an important verb pattern to learn:

• бояться собак = to be afraid of dogs
• бояться темноты = to be afraid of the dark
• бояться родителей = to be afraid of one’s parents

So the case here is controlled by the verb бояться.

The noun машина is a feminine noun ending in -а.

For many feminine nouns of this type, the genitive singular ending is -ы or -и:

• машина → машины
• кошка → кошки
• книга → книги

In this sentence, машины is genitive singular because it depends on боится.

It means of the car literally, though in natural English we say afraid of the car.

Because мы means we, and the verb in the past tense agrees with the subject.

Russian past tense forms show gender in the singular, but number in the plural:

• я взял / взяла = I took
• он взял = he took
• она взяла = she took
• мы взяли = we took

So the form взяли is plural because the people doing the action are we, not because of the cat.

Russian word order is fairly flexible, but the sentence as written is very natural.

• Для поездки к ветеринару мы взяли переноску, потому что кошка боится машины.

This order presents:

1. the situation/purpose first,
2. then the main action,
3. then the reason.

You could move parts around for emphasis, for example:

• Мы взяли переноску для поездки к ветеринару, потому что кошка боится машины.

That is also correct and natural.

But not every rearrangement sounds equally neutral. The original sentence feels smooth because it starts with the trip context and then tells what was done.

It gives the purpose/context for the action.

Literally, it is something like:

• for the trip to the veterinarian

In more natural English, that often corresponds to:

• For the trip to the vet, we took the carrier
• or simply We took the carrier for the trip to the vet

So this opening phrase tells you what occasion the action relates to. It sets the scene before the main clause.

Yes, but the meaning and structure would be a little different.

For example:

• Мы взяли переноску к ветеринару would not sound as good if you mean for the trip to the vet.
• Russian prefers the fuller phrase для поездки к ветеринару when the idea is specifically for the trip/journey.

If you wanted a simpler sentence, you might say something like:

• Мы взяли переноску, когда поехали к ветеринару.
  = We took the carrier when we went to the vet.

So поездки helps package the idea neatly as for the trip to the vet.

Yes. Ветеринар is the standard word for veterinarian / vet.

In everyday Russian, people very commonly say:

• идти к ветеринару = to go to the vet
• отвезти кошку к ветеринару = to take the cat to the vet

There is also the adjective ветеринарный:

• ветеринарная клиника = veterinary clinic

So this is useful, common vocabulary for pet-related situations.