Mbwa wangu ni mdogo, lakini mwingine ni mkubwa.

In Swahili, the noun usually comes first, and words that describe or limit it come after it.

So:

• mbwa wangu = my dog
• mbwa mdogo = small dog

This is different from English, where my comes before the noun.

Here, ni is the copula, the word that means is/are.

So:

• Mbwa wangu ni mdogo = My dog is small
• mwingine ni mkubwa = the other one is big

A useful contrast:

• mbwa wangu mdogo = my small dog
• mbwa wangu ni mdogo = my dog is small

So ni is important because it turns the adjective into the main statement.

In Swahili, adjectives normally come after the noun they describe.

Examples:

• mbwa mdogo = small dog
• mtoto mkubwa = big child / older child

In your sentence, the adjectives come after ni because they are being used predicatively:

• ni mdogo = is small
• ni mkubwa = is big

So the position is completely normal for Swahili.

This is a very common learner question.

Mbwa is one of those nouns whose own form does not show m-, but because it refers to an animate being, Swahili often uses animate agreement with words connected to it.

That is why you see:

• mbwa wangu
• mbwa mdogo
• mwingine
• mkubwa

rather than forms that would be used with many non-living nouns.

So the important idea is:

• the noun itself is mbwa
• but the agreeing words often behave as if the noun is in the animate/human-type agreement pattern

This is very normal with animals in Swahili.

Because the possessive must agree with the noun, and here mbwa is being treated with animate agreement.

The possessive stem is -angu = my, and the agreement part changes depending on the noun class.

So:

• mbwa wangu = my dog
• but nyumba yangu = my house

So wangu is correct here because of the animate agreement used with mbwa.

Mwingine means another one or the other one, depending on context.

It comes from the idea -ingine = other / another, with an agreement prefix added.

Here:

• m- + -ingine → mwingine

Because the noun mbwa is understood, Swahili does not need to repeat it.

So mwingine here means something like:

• another dog
• the other dog
• the other one

Which exact English version sounds best depends on context.

Because Swahili often leaves out a noun when it is already clear from context.

So instead of saying:

• mbwa wangu ni mdogo, lakini mbwa mwingine ni mkubwa

the sentence says:

• Mbwa wangu ni mdogo, lakini mwingine ni mkubwa

This is natural and avoids repetition. English does the same thing sometimes with the other one.

Yes. That would also be correct.

• Mbwa wangu ni mdogo, lakini mbwa mwingine ni mkubwa.

This version is a little fuller because it repeats mbwa. The original sentence is more concise because the repeated noun is omitted.

So both are possible:

• ...lakini mwingine ni mkubwa = more compact
• ...lakini mbwa mwingine ni mkubwa = more explicit

Yes, very closely.

Lakini is a common word for but and joins two contrasting ideas:

• Mbwa wangu ni mdogo = My dog is small
• lakini mwingine ni mkubwa = but the other one is big

So it functions much like English but.

Yes.

These words are very common and can have a wider meaning depending on context.

• mdogo can mean small, young, younger, or minor
• mkubwa can mean big, older, elder, important, or great

In this sentence, the most natural meaning is probably physical size: small and big. But in another context, they could refer to age or status.

You know from the agreement words around it.

The noun mbwa can refer to:

• dog
• dogs

The form itself does not change. So Swahili often shows singular or plural through agreement.

In this sentence, the clues are:

• mdogo = singular
• mwingine = singular
• mkubwa = singular

If it were plural, you would expect plural agreement forms instead.

So even though mbwa itself looks the same, the rest of the sentence tells you it is singular.

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

Whether something is a dog, the dog, or just dog is understood from context.

For example:

• mbwa wangu already naturally means my dog
• mwingine can mean another one or the other one, depending on the situation

So this is normal Swahili, not something missing.