कुत्ता और बिल्ली पशु चिकित्सालय में हैं।

Because the subject is compound: कुत्ता और बिल्ली = the dog and the cat.
That means there are two beings, so Hindi uses the plural form of to be:

• है = is for singular
• हैं = are for plural or respectful singular

So कुत्ता और बिल्ली ... हैं means the dog and the cat ... are.

In Hindi, when you have two nouns joined by और (and), the verb usually agrees with the whole group as plural. If the group is mixed gender—here कुत्ता is masculine and बिल्ली is feminine—Hindi normally uses masculine plural agreement.

So:

• कुत्ता = masculine
• बिल्ली = feminine
• together = mixed group
• result = हैं with masculine-plural-type agreement

This is a very common pattern in Hindi.

में is a postposition meaning in, inside, or at in many contexts.

So:

• पशु चिकित्सालय में = in the veterinary hospital/clinic

Unlike English, Hindi usually puts this kind of word after the noun, not before it:

• English: in the hospital
• Hindi: hospital in → चिकित्सालय में

That is why it is called a postposition rather than a preposition.

Hindi word order is often Subject–Object/Complement–Verb, and postpositions come after nouns.

So the structure here is roughly:

• कुत्ता और बिल्ली = subject
• पशु चिकित्सालय में = location
• हैं = verb

Literal order: Dog and cat veterinary hospital in are

Natural English order: The dog and the cat are in the veterinary hospital.

This is completely normal in Hindi.

पशु चिकित्सालय means animal hospital, veterinary hospital, or vet clinic, depending on context.

It is made from:

• पशु = animal
• चिकित्सालय = clinic / hospital / place of treatment

So together it is literally something like animal-treatment place.

In everyday speech, many speakers might also say something simpler such as पशु अस्पताल.

Hindi normally does not use articles like English a, an, and the.

So:

• कुत्ता can mean a dog or the dog
• बिल्ली can mean a cat or the cat

The exact meaning depends on context. If the meaning has already been given to the learner as the dog and the cat, that is perfectly fine, but Hindi itself does not mark that with a separate word.

कुत्ता is the direct singular form: dog.

You would expect कुत्ते in some other situations, for example:

• as masculine plural
• or in certain oblique contexts before postpositions

But here कुत्ता is just one dog, and it is part of the subject. So the singular noun stays कुत्ता.

The sentence is plural overall because there are two nouns together, not because कुत्ता itself is plural.

Because it is singular and is being used in a straightforward way as part of the subject.

• बिल्ली = cat
• here it means one cat

Hindi feminine nouns do not always visibly change in the same way masculine nouns do. In this sentence, बिल्ली stays as it is.

Both can work, depending on context.

Literally, it means something like:

• are in the animal hospital / veterinary clinic

But in natural English, people often say:

• The dog and the cat are at the vet.

So the Hindi wording is a bit more formal/literal, while English may prefer the more idiomatic at the vet.

Yes, it sounds somewhat formal or textbook-like, mainly because of पशु चिकित्सालय.

In everyday conversation, many speakers might say something like:

• कुत्ता और बिल्ली पशु अस्पताल में हैं।
• or even another simpler expression depending on region and context

But the given sentence is absolutely correct Hindi.

और means and.

So:

• कुत्ता और बिल्ली = dog and cat

It simply joins the two nouns into one combined subject. Because of that combined subject, the verb becomes plural: हैं.

In this sentence, it stays the same: पशु चिकित्सालय में.

Many Hindi nouns take an oblique form before a postposition like में, but not all nouns show a visible change. Nouns of this type often remain unchanged in form.

So you can think of it as:

• base noun: पशु चिकित्सालय
• with postposition: पशु चिकित्सालय में

No visible change is needed here.

A simple learner-friendly pronunciation is:

kuttā aur billī pashu chikitsālay mẽ haĩ

A few helpful notes:

• कुत्ता = kuttā
• और = aur
• बिल्ली = billī
• में has a nasal sound: mẽ
• हैं also has a nasal sound: haĩ

The nasalization in में and हैं is important in standard pronunciation.

Not naturally in this exact form.

Because the nouns are singular:

• कुत्ता = a/the dog
• बिल्ली = a/the cat

the sentence is most naturally understood as referring to one dog and one cat.

If you wanted a more general plural meaning like dogs and cats are in veterinary hospitals, the Hindi would normally be phrased differently, with plural nouns and probably other context markers.