La persona adoptante va a responsabilizarse del animal.

La persona adoptante is a more explicit, formal way to say the adopting person.

A few notes:

• persona is always grammatically feminine, so it takes la, even if the actual person is male.
• adoptante describes the person who is adopting.
• In many real-life contexts, especially legal, administrative, or animal shelter language, la persona adoptante sounds more formal and precise.

You could also hear:

• el adoptante = the male adopter
• la adoptante = the female adopter

But la persona adoptante avoids focusing on gender and sounds more official.

Adoptante means adopting or adopter, depending on context.

It comes from the verb adoptar and is a present participle / agent-style adjective or noun. In Spanish, words ending in -ante often have the same form for masculine and feminine:

• el estudiante
• la estudiante
• el cantante
• la cantante
• el adoptante
• la adoptante

So adoptante does not change to mark gender. The article or surrounding words tell you the gender if needed.

Ir a + infinitive is a very common Spanish structure used to talk about the near future or an intended future action.

So:

• va a responsabilizarse = is going to take responsibility
• literally: goes to take responsibility

In this sentence:

• va = third person singular of ir
• a = linking preposition
• responsabilizarse = to take responsibility / to make oneself responsible

This is often more common in everyday speech than the simple future:

• va a responsabilizarse = is going to take responsibility
• se responsabilizará = will take responsibility

Both are correct, but va a... often sounds more natural and immediate.

The -se shows that this is a pronominal verb: responsabilizarse de algo/alguien.

It means:

• to take responsibility for
• to become responsible for

So:

• responsabilizar usually means to make someone responsible
• responsabilizarse means to take responsibility oneself

Examples:

• La familia se responsabiliza del perro.
  = The family takes responsibility for the dog.

• La protectora quiere que alguien se responsabilice del animal.
  = The shelter wants someone to take responsibility for the animal.

So the se is not optional here if you want this meaning.

Because de + el contracts to del in Spanish.

So:

• de + el = del
• a + el = al

That is why you get:

• responsabilizarse del animal

not:

• responsabilizarse de el animal ❌

One exception: if el is part of a proper name, there is no contraction:

• de El Escorial
  not del Escorial when referring to the full proper name.

But in normal cases like el animal, you must use del.

Because the verb pattern is:

• responsabilizarse de + noun/person

So Spanish says literally something like:

• to take responsibility of/for something

This is just how the verb works. Many Spanish verbs require specific prepositions, and they do not always match English.

Examples:

• Se responsabilizó del proyecto.
• Nos responsabilizamos de los gastos.
• ¿Quién se va a responsabilizar del gato?

So after responsabilizarse, you normally use de.

Yes. That is a very common alternative.

For example:

• La persona adoptante va a hacerse responsable del animal.

This is very similar in meaning to:

• La persona adoptante va a responsabilizarse del animal.

Both are correct. The difference is mostly one of style:

• responsabilizarse de sounds a bit more formal or institutional
• hacerse responsable de is also common and very natural

In legal, shelter, or administrative contexts, responsabilizarse de fits very well.

No. El animal is grammatically masculine regardless of the animal’s actual sex.

In Spanish, grammatical gender and real-world sex are not always the same thing.

So:

• el animal = masculine noun
• even if the animal is female, you can still say el animal

If you want to specify the sex, you would normally use a more specific noun:

• la perra = female dog
• el perro = male dog
• la gata = female cat
• el gato = male cat

But with the general word animal, the default article is el.

Because Spanish often omits subject pronouns when the verb already makes the subject clear.

Here, va tells you the subject is:

• he/she/it
• or you (formal singular, depending on context)

But the sentence already has an explicit subject:

• La persona adoptante

So there is no need to add ella.

Spanish usually avoids unnecessary subject pronouns unless you want emphasis or contrast.

Compare:

• La persona adoptante va a responsabilizarse del animal.
• Ella va a responsabilizarse del animal.

The second one would only be used if you wanted to stress she.

It is understandable and correct, but it sounds somewhat formal, administrative, or legal.

You are especially likely to see it in contexts like:

• adoption paperwork
• animal shelters
• official forms
• regulations
• contracts

In more everyday speech, people might say:

• la persona que adopta
• quien adopta el animal
• el/la adoptante

So yes, it is normal, but it belongs more to formal written Spanish than casual conversation.

Yes, there is a small difference.

• se responsabiliza del animal = takes responsibility for the animal / is taking responsibility
• va a responsabilizarse del animal = is going to take responsibility for the animal

So va a responsabilizarse points to a future or forthcoming action, often something that will happen as a result of the adoption process.

This fits well in contexts like agreements or procedures, where the person has not yet fully assumed responsibility but is about to.

Yes, although the original order is the most neutral.

Standard order:

• La persona adoptante va a responsabilizarse del animal.

Other possible orders are more marked and usually used for emphasis:

• Del animal va a responsabilizarse la persona adoptante.
  This strongly emphasizes del animal.

• Va a responsabilizarse del animal la persona adoptante.
  Also possible, but less neutral.

For learners, the original version is the best model to follow.

Yes, especially in formal or semi-formal settings related to animal adoption.

In everyday speech in Spain, though, people might choose simpler wording, such as:

• La persona que lo adopte se hará responsable del animal.
• Quien adopte al animal se responsabilizará de él.
• La adoptante se va a hacer cargo del animal.

Your sentence is perfectly correct and natural in the right register. It sounds like something from a shelter document, adoption contract, or official explanation.