Блоха на собаці.

Because after на when it means on in a location sense, Ukrainian normally uses the locative case.

• Dictionary form: собака = dog
• Locative singular: на собаці = on the dog

So собаці is the locative form of собака.

In Ukrainian, the present-tense verb to be is often omitted.

So English A flea is on the dog is naturally just:

Блоха на собаці.

Ukrainian often leaves out є in simple present-tense sentences like this, especially when it is obvious.

Here на means on.

So:

• на столі = on the table
• на собаці = on the dog

It is a very common preposition, but its meaning can vary depending on context. In this sentence, it clearly expresses location: something is physically on the dog.

It can mean either, depending on context.

Ukrainian has no articles like a or the, so блоха by itself can be:

• a flea
• the flea

The surrounding context tells you which meaning is intended.

Блоха is in the nominative case, which is the basic dictionary form and is often used for the subject of the sentence.

Here, the flea is the thing being talked about, so блоха stays in the nominative.

No, Ukrainian word order is fairly flexible.

Блоха на собаці. is a neutral, natural order.

But other orders are possible, for example:

• На собаці блоха.
• На собаці є блоха.

These can shift emphasis slightly. The original version simply presents the flea first and then says where it is.

A simple approximation is:

blo-KHA na so-BA-tsi

A few helpful points:

• х sounds like a throaty kh, not like English h
• ці sounds roughly like tsi
• the stress is on the last syllable in блоха́
• the stress in соба́ці stays on ба́

So: blo-KHA na so-BA-tsi

That is just how many feminine nouns change in the locative singular.

For собака:

• nominative: собака
• locative: собаці

This kind of change is part of the noun’s declension pattern. When learning Ukrainian, it helps to memorize nouns together with their case forms, not just the dictionary form.

Not if you mean location.

На собаці means on the dog as a location.

На собаку uses the accusative case, and with на that often suggests movement onto something, not simple location.

So:

• Блоха на собаці = The flea is on the dog
• something like стрибнула на собаку = jumped onto the dog

Yes. Блоха is a feminine noun.

That matters because adjectives and some past-tense verbs would agree with it. For example, if you later add an adjective, it would also be feminine:

• велика блоха = a big flea

So it is useful to learn блоха as a feminine noun from the start.

Yes. It is short, but completely natural.

Ukrainian often allows very compact sentences, especially when the meaning is straightforward. Блоха на собаці. sounds like a simple statement, caption, or observation such as A flea on the dog / The flea is on the dog, depending on context.