אני מסרקת ומברישה כלב מהגזע הזה.

Yes. These verb forms show that the speaker is feminine singular in the present tense.

• מסרקת = feminine singular present of לסרק
• מברישה = feminine singular present of להבריש

So this sentence is being said by a woman or girl. A male speaker would say:

אני מסרק ומבריש כלב מהגזע הזה.

Not exactly. In the Hebrew present tense, the verb usually shows gender and number, but not person.

So מסרקת could mean:

• I comb if the speaker is female
• you comb if speaking to one female
• she combs

That is why אני is helpful here: it makes it clear that the subject is I.

Yes, this is how modern Hebrew expresses the present tense.

Hebrew present-tense forms are historically participles, but in everyday modern Hebrew they function as normal present-tense verbs. So אני מסרקת ומברישה is the ordinary way to say I am combing and brushing / I comb and brush.

Also notice that Hebrew does not use a separate word for am here. You do not say a word for am in a sentence like this.

Here, the מ is just part of the present-tense verb pattern.

Many Hebrew present-tense forms in certain verb patterns begin with מ, so in this sentence:

• מסרקת
• מברישה

the initial מ is not a separate pronoun or preposition. It is simply part of how these verbs are formed in the present tense.

Also, not all present-tense verbs begin with מ. For example:

• כותבת = writing
• יושבת = sitting

So this is a pattern of these particular verbs, not a rule for every present-tense verb.

They are two different grooming actions:

• מסרקת comes from לסרק and means to comb
• מברישה comes from להבריש and means to brush

So the sentence uses both actions together: first combing, then brushing, or simply doing both as part of grooming.

The Hebrew conjunction ו usually means and, but its pronunciation changes depending on the sound that follows.

In many cases it is pronounced ve-, but before certain sounds it becomes u-. In ומברישה, that is the pronunciation you get.

So when reading aloud, this word is pronounced with u-, not with a plain ve-.

Because את is used only before a definite direct object.

Here, כלב is indefinite: it means a dog, not the dog. So Hebrew does not use את.

Compare:

• אני מסרקת ומברישה כלב = I comb and brush a dog
• אני מסרקת ומברישה את הכלב = I comb and brush the dog

That is a very common Hebrew rule.

Hebrew has no indefinite article. There is no separate word for a or an.

So:

• כלב can mean a dog
• הכלב means the dog

That is why כלב by itself is enough here.

That is normal Hebrew usage. מ־ / מן can mean from, but it is also used in expressions meaning of or belonging to a type/category.

So כלב מהגזע הזה means a dog of this breed or a dog from this breed.

In other words, Hebrew often uses מ־ where English would naturally use of.

Both are possible.

• מ־ is the shorter, very common form
• מן is the fuller form and can sound a bit more formal or literary

With a definite noun, מ־ combines with the ה of the noun:

• מ + הגזע → מהגזע

So מהגזע הזה is a perfectly normal everyday form.
You could also say מן הגזע הזה, but it is less compact.

Because in Hebrew, demonstratives like this usually come after the noun in this kind of phrase.

So Hebrew says:

• הגזע הזה = this breed

not the English-style order this breed.

Also notice the agreement:

• גזע is masculine singular
• so the demonstrative is הזה

If the noun were feminine singular, you would use הזאת instead.

The order here is the most neutral one:

אני + verbs + object + description

So:

אני מסרקת ומברישה כלב מהגזע הזה.

That is a natural default order. Hebrew does allow more flexibility than English, but changing the order often adds emphasis or changes the focus.

For example, moving כלב מהגזע הזה earlier could sound more marked or emphatic. For a learner, the word order in your sentence is a very good standard model.