الدكتور البيطري كتب التطعيم في دفتر التطعيمات.

Because البيطري is functioning like an adjective: the veterinary doctor / the vet.

In Arabic, adjectives usually match the noun they describe in:

• definiteness: definite or indefinite
• gender
• number

So:

• دكتور بيطري = a veterinary doctor
• الدكتور البيطري = the veterinary doctor

Since الدكتور is definite because of الـ, the adjective البيطري must also be definite.

البيطري means veterinary or vet-related.

So:

• الدكتور البيطري literally means the veterinary doctor
• In natural English, that is usually just the vet

The base idea comes from بيطري, which is used for animals, veterinary medicine, and vets.

Examples:

• طبيب بيطري = veterinarian
• مستشفى بيطري = veterinary hospital

Arabic allows more than one common word order.

Two very common patterns are:

• Verb + subject + object
• Subject + verb + object

So both of these are possible in Arabic:

• كتب الدكتور البيطري التطعيم...
• الدكتور البيطري كتب التطعيم...

The version you were given starts with the subject, which can feel a bit like:

• The vet wrote/recorded the vaccination...

That word order is completely normal.

كتب is the past tense verb he wrote.

The root is ك-ت-ب, which is related to writing.

Some useful forms:

• كتب = he wrote
• كتبت = I wrote / she wrote (depending on context)
• كتبوا = they wrote
• يكتب = he writes / he is writing

In this sentence, كتب matches الدكتور البيطري, which is masculine singular.

Yes, word-for-word it looks like wrote the vaccination, which sounds odd in English.

But Arabic often uses كتب in contexts where English might say:

• wrote down
• recorded
• entered
• noted

So in context, كتب التطعيم في دفتر التطعيمات means something like:

• He recorded the vaccination in the vaccination booklet/record book.

That is a more natural English rendering, even if the Arabic uses the basic verb كتب.

Great question.

• التطعيم = the vaccination / vaccination
• التطعيمات = the vaccinations

So:

• تطعيم is singular or a mass noun
• تطعيمات is the regular feminine plural

In the sentence:

• التطعيم = the specific vaccination that was recorded
• دفتر التطعيمات = literally the vaccinations notebook/booklet, meaning a record book for vaccinations in general

Because both are definite in this sentence.

• التطعيم = the vaccination
• دفتر التطعيمات = the vaccination record book / the vaccinations booklet

Arabic uses الـ to mark definiteness, similar to the in English.

In دفتر التطعيمات, the second word helps specify what kind of notebook/booklet it is:

• دفتر = notebook / booklet / record book
• التطعيمات = vaccinations

So the phrase means something like:

• the vaccination booklet
• the vaccination record book

دفتر means notebook, booklet, register, or record book, depending on context.

In this sentence, the best sense is something like:

• record book
• vaccination booklet
• vaccination card/booklet

So دفتر التطعيمات is not just any notebook. It is specifically the book or booklet where vaccinations are recorded.

في means in.

So:

• في دفتر التطعيمات = in the vaccination record book

It is a very common preposition in Arabic.

Examples:

• في البيت = in the house
• في المدرسة = at/in the school
• في الدفتر = in the notebook

A natural Egyptian-style pronunciation would be roughly:

ed-doktoor el-bayṭari katab et-taṭʿiim fi dafter et-taṭʿiimaat

A few notes:

• الدكتور → often pronounced ed-doktoor
• البيطري → el-bayṭari
• التطعيم → et-taṭʿiim
• دفتر → dafter
• التطعيمات → et-taṭʿiimaat

You may see slightly different spellings in transliteration, because transliteration systems vary.

That happens because of sun letters.

The Arabic definite article is written الـ, but its pronunciation changes depending on the next consonant.

For example:

• الدكتور is pronounced ed-doktoor, not al-doktoor
• التطعيم is pronounced et-taṭʿiim, not al-taṭʿiim

This is because د and ت are sun letters, so the l sound in الـ assimilates to the next consonant.

But in a word like البيطري, the ب is not a sun letter, so you keep the l sound:

• el-bayṭari

It is understandable in both, but it leans a bit toward a neutral/written style.

The words themselves are very normal and usable in Egyptian:

• الدكتور
• البيطري
• كتب
• التطعيم
• دفتر التطعيمات

In very conversational Egyptian, someone might also choose slightly different wording depending on context, especially for official record-keeping. For example, a speaker might use a verb closer to recorded or registered instead of just wrote.

But as a learner sentence, this is perfectly clear and useful.

Yes, absolutely.

Even though it literally means the veterinary doctor, the most natural English translation in many contexts is simply:

• the vet

That is often the best choice in normal English.

So depending on how literal or natural you want to be:

• literal: the veterinary doctor
• natural: the vet

There actually is definiteness in Arabic, but it is expressed differently from English.

In دفتر التطعيمات, the phrase is an iḍāfa-like construction, a noun relationship similar to:

• book of vaccinations
• vaccination book

The first noun, دفتر, often does not take الـ directly in this kind of structure if the whole phrase is being defined by the second noun.

So:

• دفتر تطعيمات = a vaccination book
• دفتر التطعيمات = the vaccination book or a/the book of the vaccinations, depending on context

This is a very common Arabic pattern.

It can mean either, depending on context.

تطعيم can refer to:

• vaccination as a process
• a vaccine shot / vaccination event
• the general idea of immunization

In this sentence, because it is something being written in a record book, it most naturally refers to:

• the vaccination that was given
• the vaccination entry

So context tells you the exact nuance.

Yes, it is okay and understandable.

For a learner, it is useful because it clearly shows:

• a subject phrase: الدكتور البيطري
• a past tense verb: كتب
• an object: التطعيم
• a prepositional phrase: في دفتر التطعيمات

So it is a solid example sentence.

Just remember that in natural English, wrote the vaccination is better understood as:

• wrote down the vaccination
• recorded the vaccination

That is mainly a translation issue, not a problem with the Arabic sentence itself.