Die Katze fühlt sich bedroht.

Because Katze is a feminine noun, and here it is the subject of the sentence, so it takes the nominative article die.

• die Katze = the cat
• der Katze would be a different case, usually dative or genitive

In this sentence, the cat is the one doing the feeling, so nominative is needed.

fühlt sich is the verb sich fühlen, which means to feel in the sense of to feel a certain way.

So:

• fühlen = to feel
• sich fühlen = to feel, to feel oneself, to feel in some condition

Common examples:

• Ich fühle mich müde. = I feel tired.
• Er fühlt sich gut. = He feels good.
• Die Katze fühlt sich bedroht. = The cat feels threatened.

The reflexive pronoun is a normal part of this verb pattern in German.

German often uses a reflexive pronoun where English does not.

With sich fühlen, the reflexive pronoun changes depending on the subject:

• ich fühle mich
• du fühlst dich
• er/sie/es fühlt sich
• wir fühlen uns
• ihr fühlt euch
• sie/Sie fühlen sich

So in Die Katze fühlt sich bedroht, sich matches a third-person singular subject like die Katze.

You should learn sich fühlen as a unit, not just fühlen by itself in this kind of sentence.

Here, sich is in the accusative.

With sich fühlen, the reflexive pronoun is normally accusative:

• Ich fühle mich ...
• Du fühlst dich ...
• Sie fühlt sich ...

So sich here is not random—it is the accusative reflexive pronoun for er/sie/es.

Here, bedroht functions like an adjective, meaning threatened.

It comes from the verb bedrohen = to threaten, and bedroht is originally the past participle. But in sentences like this, it behaves like an adjective after sich fühlen:

• sich bedroht fühlen = to feel threatened
• sich verletzt fühlen = to feel hurt
• sich beobachtet fühlen = to feel watched

So a useful way to understand it is: it is a participle being used adjectivally.

Because it comes after the verb and is being used predicatively, not directly before a noun.

Compare:

• Die Katze fühlt sich bedroht.
  Here bedroht describes the cat after the verb, so no ending is added.

• die bedrohte Katze
  Here bedrohte comes before the noun Katze, so it needs an adjective ending.

This is a very common difference in German:

• Der Mann ist müde.
• der müde Mann

No ending after ist, but an ending before a noun.

Yes, you can say Die Katze ist bedroht, but it means something slightly different.

• Die Katze fühlt sich bedroht = the cat feels threatened
  This focuses on the cat’s perception or emotional state.

• Die Katze ist bedroht = the cat is threatened / in danger
  This sounds more like an objective situation.

So fühlt sich bedroht is about how the cat experiences the situation, while ist bedroht is more about the actual condition.

Because German main clauses usually follow the V2 rule: the finite verb goes in the second position.

In this sentence:

• Die Katze = first position
• fühlt = second position
• sich bedroht = the rest

That is standard German word order for a statement.

Yes, in normal German that would sound wrong.

When you mean to feel threatened / tired / safe / uncomfortable, German usually uses sich fühlen:

• Ich fühle mich müde.
• Sie fühlt sich sicher.
• Die Katze fühlt sich bedroht.

Without the reflexive pronoun, fühlen usually needs a direct object:

• Ich fühle den Stoff. = I feel the fabric.
• Er fühlt den Puls. = He feels the pulse.

So the reflexive pronoun is important here.

A few things matter here:

• ü is not like English oo or u
• hlt creates a tight consonant cluster at the end

A rough guide:

• fühlt sounds approximately like fyoolt, but that is only an approximation
• the ü is made with the tongue position of ee but with rounded lips

If pronunciation is your focus, it may help to break it down:

• fühl-
• then add -t

Also note that fühlt is the form for er/sie/es and ihr from the verb fühlen.

Because all nouns are capitalized in German.

So:

• die Katze
• der Hund
• das Haus

This is one of the most noticeable spelling differences from English. In the sentence, Katze is a noun, so it must be capitalized.

Yes, but the finite verb still has to stay in second position in a main clause.

For example:

• Die Katze fühlt sich bedroht.
• Bedroht fühlt sich die Katze.

The second version is possible, but it is more marked and puts emphasis on bedroht. The neutral, normal version is:

• Die Katze fühlt sich bedroht.

So yes, word order can change, but German word order rules still apply.

The dictionary form is fühlen.

Here is the relevant conjugation:

• ich fühle
• du fühlst
• er/sie/es fühlt
• wir fühlen
• ihr fühlt
• sie/Sie fühlen

Since die Katze is third-person singular, German uses fühlt.