Das ist mein Hund.
English: This is my dog.
Possessivpronomen are German words like 'mein', 'dein', 'sein', etc., used to show that something belongs to someone. They are called possessive pronouns.
Use possessive pronouns in German to talk about things that belong to people or show relationships, for example: 'my book', 'her car', or 'our house'.
Das ist mein Hund.
English: This is my dog.
Wo ist dein Schlüssel?
English: Where is your key?
Sein Auto ist neu.
English: His car is new.
Unsere Lehrerin ist freundlich.
English: Our teacher is friendly.
Ist das euer Haus?
English: Is that your (plural) house?