I'm Ana, and I have 3 dogs, these. Their names are Blondie, Antara and Aragorn.

BothTwo of them are female and one is male.

Every morning, I go whith them to the park,. I throw a ball for everyone,all of them, and they love the balls.

Antara and Blondie only play with the ball, sbecause they doesn’n't like to play with other dogs,. Aragorn prefers to plays first with the ball first, and afterwards he plays with other dogs.

They are a good dogs, I love them.

BothTwo of them are female and one is male.

Both is used to reference two subjects but in this case we are talking about three dogs. If you were stating you have only two dogs then you could say "Both are females".

They are Australian Cattle Dogs, and they are very hyperactive dogs, becausedue to this they need a lot exercise every day.

You may need to drop the second "dogs" as we already know about the subject. "because" does not fit here. I can not fully explain why but it is not natural.

Every morning, I go whith them to the park, I throw ball for everyone and play fetch with them, they love the balls.

Throwing the ball for a dog is usually called playing fetch. The dog "fetches" the ball. This sentence repeats "them" a lot and could probably be improved.

Antara and Blondie only play with the ball, sthey doesn’t like playing with other dogs, while Aragorn prefers to plays first with the ball and after then plays with other dogs.

"she" is referencing two dogs so it needs to be they for plural.
Including a word like "while" shows more of a contrast in the behaviors of the dogs.
"prefer" needs to be "prefers" due to the singular subject(Aragorn). Example: He plays, They play.

I'mMy name is Ana,. I have 3 dogs,: theseir names are Blondie, Antara and Aragorn.

You should use a colon (':') instead of a comma (',') because you are introducing a list, in this case, the name of each dog.

Using the demonstrative pronoun 'these' is not correct here, because it needs to be clearly referring to a specific noun. In your sentence, you only vaguely point to 'names' without properly introducing it as the subject. The sentence doesn’t set up 'names' as the subject before using the demonstrative pronoun 'these'.

(A 'noun' typically refers to a person, place, thing, organization, or idea.)

BothTwo of them dogs are female, and one is male.

Although 'both' refers to two things or objects, using that word in this context is not correct, because you have more than two dogs.

They are Australian Cattle Ddogs, and they are very hyperactive dogs, because t. They need a lot exercise every day.

'Dogs' should not be capitalized since it is not placed at the start of a sentence, and the word 'dogs' is a common noun. In English, we do not capitalize common nouns except at the start of a sentence.

However, 'Australian Cattle' is correctly capitalized, as it is a proper noun. In English, we always capitalize proper nouns.

Common noun: typically refers to ANY person, place, thing, or idea.

Proper noun: typically refers to a SPECIFIC person, place, thing, organization, or idea.

Every morning, I go whit themtake the dogs to the park,. I throw a ball for everyone, they lovethe dogs to fetch. They love playing with the balls.

You don't technically go to the park WITH them, because you are the one in control of where they go. Therefore, it is more accurate to say that you are taking them (the dogs) to the park.

If you are throwing three balls (one for each dog), you could write something like:

"Every morning, I take the dogs to the park. I throw three balls, one for each dog. They love playing ball."

I would not recommend writing "they love playing with the balls" or otherwise using the phrase "the balls" because it can be suggestive to some English speakers. 'Balls' is a slang term in English for 'testicles' (or 'testículos' in Spanish).

Antara and Blondie only play with the ball, she doesn’t like play with other dogs, Aragorn prefer plays first with the ball and after he plays with other dogs.

This paragraph is grammatically incorrect and ambiguous.

You are referring to 'Antara and Blondie' (two dogs) and then incorrectly qualifying what those two dogs are doing by referring to one particular dog ("she doesn't like play with other dogs").

They are a good dog,s. I love them.

You are referring to more than one dog, so you should drop the indefinite article ('a') and use the plural form of 'dog'.
Singular: 'dog' (exactly one)
Plural: 'dogs' (two or more)

I'm Ana, and I have 3 dogs, these. Their names are Blondie, Antara and Aragorn.

BothTwo of them are female and one is male.

They are Australian Cattle Dogs, and they are very hyperactive dogs, because they need a lot of exercise every day.

Every morning, I go whith them to the park, I and throw a ball for everyone, t. They love the balls.

Antara and Blondie only play with the ball, sthey doesn’t like to play with the other dogs. However, Aragorn prefer playss to first play with the ball and after that, he plays with the other dogs.

They are a good dogs, I love them.