Tiu hundo estas de malgranda raso.

Tiu means that or that one. So Tiu hundo means that dog.

It is used to point to a specific dog, not just any dog.

Compare:

• tiu hundo = that dog
• ĉi tiu hundo = this dog
• la hundo = the dog

So tiu is more specifically pointing something out than la.

Estas is the present-tense form of esti, which means to be.

So:

• estas = is / am / are

Esperanto verbs do not change depending on the subject, so:

• mi estas = I am
• vi estas = you are
• li estas = he is
• ili estas = they are

That makes Esperanto verb forms much simpler than English.

Because hundo is the subject of the sentence, and subjects do not take -n.

In Esperanto, the -n ending usually marks the direct object. But here the dog is not an object; it is the thing being talked about:

• Tiu hundo = the subject
• estas de malgranda raso = what is being said about the subject

So hundo stays in its basic form.

Raso means breed.

So de malgranda raso literally means of a small breed.

This is talking about the dog's breed or type, not directly about the dog's current size.

De here means of.

In this sentence, it links the dog to its breed:

• de malgranda raso = of a small breed

This is similar to English a dog of a small breed.

The important idea is that the dog belongs to a breed that is small in size.

Because that would suggest that the dog is a breed, which is not what you mean.

• Tiu hundo estas de malgranda raso = the dog is of a small breed
• Tiu hundo estas malgranda raso = the dog is a small breed

That second version is unnatural because a dog is an individual animal, while a breed is a category.

So de is necessary to show the relationship.

Malgranda means small.

It is built from:

• granda = big
• mal- = a prefix meaning the opposite

So:

• granda = big
• malgranda = small

This is a very common Esperanto pattern. The prefix mal- often creates the opposite of a word.

Examples:

• bona = good
• malbona = bad
• juna = young
• maljuna = old

Because malgranda is an adjective, and Esperanto adjectives end in -a.

Here it describes raso, not hundo:

• malgranda raso = small breed

Adjectives in Esperanto agree with the noun they describe in number and case.

Since raso is:

• singular
• not accusative

the adjective is also just:

• malgranda

If it were plural, you would get:

• malgrandaj rasoj = small breeds

Because Esperanto has no indefinite article like English a or an.

So:

• raso can mean a breed
• malgranda raso can mean a small breed

Esperanto only has the definite article la, meaning the.

So:

• de malgranda raso = of a small breed
• de la malgranda raso = of the small breed

In this sentence, the breed is not being identified as a specific already-known one, so no la is used.

Yes, but it means something different.

• Tiu hundo estas malgranda = That dog is small
• Tiu hundo estas de malgranda raso = That dog is of a small breed

The first talks about the dog's actual size. The second talks about the breed or type of dog.

A dog from a small breed is usually small, but the two ideas are not exactly the same.

No. This sentence is natural, but there are other possible ways to express the same idea.

For example:

• Tiu hundo apartenas al malgranda raso. = That dog belongs to a small breed.

This version is a bit more explicit.

Still, Tiu hundo estas de malgranda raso is a good, straightforward sentence, and it is useful because it shows how de can express of in a classification sense.

The given word order is the most neutral and natural one:

• Tiu hundo estas de malgranda raso.

Esperanto word order is fairly flexible, but changing it usually adds emphasis or sounds more literary.

For normal everyday usage, the original order is the best choice.