Is Vogelbad der, die or das?

The correct German article for Vogelbad is das. The noun Vogelbad is Neuter. So you always say: das Vogelbad. Learn the article together with the noun — German nouns don't follow predictable gender rules most of the time.

The plural of Vogelbad is: die Vogelbäder. In the plural, every German noun takes the article "die". So: die Vogelbäder. Example: ein Vogelbad → zwei Vogelbäder.

Correct: die Vogelbäder. The form "die Vogelbads" is wrong. The plural of das Vogelbad is die Vogelbäder. In the nominative plural, you always use the article "die".

das Vogelbad follows the four German cases. Nominative: das Vogelbad, Accusative: das Vogelbad, Dative: dem Vogelbad, Genitive: des Vogelbades. In plural: die Vogelbäder / den Vogelbädern. Learn these forms together with the noun.

The genitive singular of das Vogelbad is: des Vogelbades. The genitive plural is der Vogelbäder. German uses the genitive to express possession or belonging. Example: die Farbe des Vogelbades.

The dative plural of Vogelbad is: den Vogelbädern. In German, dative plural nouns usually end in "-n". So you say: "mit den Vogelbädern". Use this case after prepositions like mit, von, bei, zu.

Vogelbad is a noun and must be capitalized in German. You'll find example sentences above for each case. The article das stays the same in nominative singular but changes in other cases. Practice declension in your own sentences.

Yes, Vogelbad is a noun (also called a substantive). German nouns are always capitalized. The article for Vogelbad is das. Every German noun has a fixed article you must memorize.