C'est mon chien.
English: This is my dog.
Possessive adjectives in French are small words used before a noun to show who owns or is connected to something. They change depending on the gender (masculine or feminine) and number (singular or plural) of the noun, not the owner.
Use French possessive adjectives when you want to say that something belongs to someone or to show relationships (like 'my book', 'your brother', 'her idea'). Always match the form to the thing owned, not to the person who owns it.
C'est mon chien.
English: This is my dog.
Voici ta maison.
English: Here is your house.
Elle aime ses chats.
English: She loves her cats.
Notre professeur est gentil.
English: Our teacher is kind.
Leurs amis arrivent.
English: Their friends are coming.