Der Hund ist blind.

Because Hund is a masculine noun in German. Its basic article is der.

• der Hund = the dog
• ein Hund = a dog

In German, every noun has a grammatical gender: masculine, feminine, or neuter. For Hund, the gender is masculine, so you use der in the nominative singular.

It is in the nominative case, because der Hund is the subject of the sentence — the one being described.

In Der Hund ist blind:

• Der Hund = the subject
• ist = is
• blind = blind

So the article is der, the nominative masculine form.

Because the subject is singular: der Hund = the dog.

The verb sein (to be) changes depending on the subject:

• ich bin = I am
• du bist = you are
• er / sie / es ist = he / she / it is
• wir sind = we are
• ihr seid = you all are
• sie / Sie sind = they / you are

Since der Hund is singular and treated like er, you use ist.

Because blind is being used predicatively, meaning it comes after sein and describes the subject.

In German, adjectives usually behave in two main ways:

1. Before a noun: they take endings

   • der blinde Hund = the blind dog

2. After verbs like sein, werden, bleiben: they do not take endings

   • Der Hund ist blind = The dog is blind

So blind stays just blind here.

This is the normal German word order for a basic statement:

• Subject: Der Hund
• Verb: ist
• Complement/adjective: blind

German main clauses usually put the conjugated verb in the second position. Here, the subject comes first, so the verb follows it.

Usually Der Hund ist blind means the dog is blind, referring to a specific dog.

But in some contexts, German can use der + singular noun to talk about something in a general sense, especially in definitions or formal statements. Still, in this simple sentence, most learners should understand it as one particular dog.

If you wanted a more general plural idea, you might say:

• Hunde sind treu. = Dogs are loyal.

Yes, but the meaning changes.

• Der Hund ist blind. = The dog is blind.
  You mean a specific dog.

• Ein Hund ist blind. = A dog is blind.
  This introduces a dog, or refers to one non-specific dog.

So both are correct, but they are not interchangeable in every situation.

Because all nouns are capitalized in German.

So:

• Hund is capitalized because it is a noun.
• blind is not capitalized because it is an adjective.
• ist is not capitalized because it is a verb.

This is one of the most noticeable spelling rules in German.

Hund is pronounced approximately like hoont, but with a short vowel and a final d that sounds a bit like t in many accents.

A rough guide:

• H = like English h
• u = like the u in put for many learners, though not exactly
• nd = the final d is often devoiced, so it may sound closer to t

So it may sound roughly like hoont or hunt, depending on how you approximate it in English.

Blind is pronounced a lot like the English word blind, but the vowel and overall sound are a bit different in native German pronunciation.

A rough guide:

• bl = like English bl
• ei = like English eye
• nd = final d may sound closer to t

So it sounds very close to English blind.

In this sentence, yes, the most natural meaning is that the dog cannot see.

German blind can also be used in figurative ways, like English:

• blindes Vertrauen = blind trust
• blind vor Wut = blind with rage

But with Der Hund ist blind, the normal interpretation is literal.

Yes, if it is already clear which dog you mean.

• Der Hund ist blind. = The dog is blind.
• Er ist blind. = He is blind.

Since Hund is a masculine noun, the pronoun used for it is er.

The plural is:

• Die Hunde sind blind. = The dogs are blind.

Notice the changes:

• der Hund → die Hunde
• ist → sind
• blind stays blind

So the adjective still does not change after sein.

They are related, but the grammar is different.

• Der blinde Hund = the blind dog
  Here, blinde comes before the noun, so it takes an adjective ending.

• Der Hund ist blind = the dog is blind
  Here, blind comes after ist, so it has no ending.

This is a very important German pattern:

• attributive adjective (before noun) → ending needed
• predicative adjective (after sein) → no ending

Yes. It is a fully complete and natural sentence.

It has everything needed:

• a subject: Der Hund
• a verb: ist
• a description: blind

German often uses short, simple sentences like this, especially in examples and early learning materials.