Pas ima buvu.

Ima is the 3rd person singular present tense of the verb imati, which means to have.

So:

• ja imam = I have
• ti imaš = you have
• on/ona/ono ima = he/she/it has

Since pas is singular, Serbian uses ima: Pas ima buvu.

Because buvu is in the accusative case, which is the case used for a direct object.

In this sentence:

• pas = the subject, the one doing the having
• buvu = the thing being had, so it is the direct object

The noun buva is a feminine noun, and in the singular its forms are:

• buva = nominative
• buvu = accusative

So:

• Buva je mala. = The flea is small.
• Pas ima buvu. = The dog has a flea/flea.

Because pas is the subject of the sentence, so it is in the nominative case, and the nominative singular form is pas.

Here:

• pas = nominative singular
• buvu = accusative singular

A useful extra point: pas is a masculine animate noun, so if it were a direct object, it would usually change form:

• Pas vidi mačku. = The dog sees the cat.
• Vidim psa. = I see the dog.

So pas stays pas here only because it is the subject.

Because Serbian does not have articles like English a/an and the.

So Pas ima buvu can mean:

• The dog has a flea
• A dog has a flea
• sometimes even The dog has the flea, depending on context

Context tells you which meaning is intended. If Serbian speakers want to be more specific, they can use other words, such as:

• taj pas = that dog
• jedna buva = one/a certain flea

But in a simple sentence like this, no article is needed.

Not completely. Serbian word order is fairly flexible because case endings help show who is doing what.

The most neutral order here is:

• Pas ima buvu.

But other orders are possible for emphasis, for example:

• Buvu ima pas. = It’s the dog that has a flea.
• Pas buvu ima. = possible, but less neutral and more marked

So for a beginner, Subject + Verb + Object is the safest pattern, but Serbian can move things around more than English.

A rough English-style guide is:

pahs EE-ma BOO-voo

A few pronunciation notes:

• a is like a in father
• i is like ee in see
• u is like oo in food
• v is pronounced like English v
• each letter is pronounced clearly

So the words are read very regularly:

• pas
• ima
• buvu

Yes. Serbian ima can sometimes mean there is/there are, depending on the sentence.

For example:

• Ima vode. = There is water.
• Ima problema. = There are problems.

But in Pas ima buvu, there is a clear subject, pas, so ima means has.

If you want to make both nouns plural, you get:

• Psi imaju buve. = Dogs have fleas.

Changes:

• pas → psi = dogs
• ima → imaju = have
• buva → buve = fleas

If you want only the object plural, you could say:

• Pas ima buve. = The dog has fleas.

That is probably a more natural sentence in everyday life than the singular version, though Pas ima buvu is still perfectly grammatical.

Yes, it is grammatically natural.

It is a simple, straightforward sentence built like this:

• subject: pas
• verb: ima
• object: buvu

The only reason it may feel slightly unusual is the meaning: in real life people more often talk about fleas in the plural. So Pas ima buve may be more common in everyday speech. But if you mean one flea, Pas ima buvu is completely fine.