La protectora de animales revisa la cartilla sanitaria.

In Spain, la protectora de animales usually means an animal shelter, animal rescue, or animal protection association.

It does not usually mean a single person here. It refers to an organization whose job is to care for and protect animals.

In everyday Spanish, people often shorten a longer expression such as la asociación protectora de animales or la sociedad protectora de animales to simply la protectora when the meaning is clear.

Because the word here is being used as a feminine noun.

Even though protector/protectora can be an adjective or refer to a person, in this sentence protectora is a shortened noun referring to an organization, and that implied noun is feminine, such as asociación or sociedad.

So:

• la protectora = the animal protection organization / shelter
• el protector would normally suggest a male protector, which is not the meaning here

Grammatically, yes, protectora can mean female protector in other contexts.

But in this sentence, la protectora de animales is much more naturally understood as the animal shelter / rescue organization, especially in Spain.

The context and the article la strongly point to an institution, not an individual woman.

De is very commonly used in Spanish to show type, category, or purpose.

So protectora de animales means something like:

• a protection organization for animals
• an animal protection association

This is a very normal Spanish pattern:

• tienda de ropa = clothes shop
• centro de salud = health centre
• protectora de animales = animal shelter / animal rescue

English often uses a noun before another noun, but Spanish often uses de instead.

In Spain, cartilla sanitaria usually refers to a health record booklet.

With animals, it often means the pet’s medical/vaccination record booklet, where vaccinations, treatments, and other health information are recorded.

So in this sentence, it is most likely the animal’s health booklet or veterinary record.

A useful note:

• For people in modern Spain, tarjeta sanitaria is more common for a health card.
• Cartilla sanitaria has a more booklet-like or record-book sense.

Because in Spanish, adjectives often come after the noun.

So:

• cartilla sanitaria = health booklet

Also, sanitaria agrees with cartilla:

• cartilla is feminine singular
• so the adjective is sanitaria (feminine singular)

Compare:

• libro médico = medical book
• tarjeta sanitaria = health card
• registro sanitario = health record

Revisa is the third-person singular present indicative of revisar.

So it matches la protectora de animales, which is a singular subject.

Conjugation:

• yo reviso
• tú revisas
• él / ella / usted revisa

Here:

• La protectora de animales revisa... = The animal shelter checks / is checking...

It can mean either, depending on context.

The Spanish present tense is often broader than the English present simple.

So revisa could mean:

• checks (habitual or general action)
• is checking (action happening now)
• sometimes reviews/examines

Without more context, both checks and is checking are possible.

Yes, very often it is.

In this kind of sentence, revisar usually means:

• to check
• to inspect
• to examine
• to review

So revisa la cartilla sanitaria means checks the health record, not revises it in the English sense of rewriting or improving a text.

Depending on context, revisar can sometimes overlap with English review, but here check/examine is the best idea.

Spanish uses the definite article the more often than English does.

So:

• La protectora de animales = the animal shelter / rescue organization
• la cartilla sanitaria = the health record booklet

In English, you might sometimes say its health record or just a health record, but Spanish often prefers the definite article when the thing is identifiable from the situation.

So la cartilla sanitaria suggests a specific booklet that both speaker and listener can identify, probably the one belonging to the animal being discussed.