These are pronouns: my, your, his, her, its, their.
One would say: my car, my dog, my books
With regards to French Pronouns, however, before indicating possession, you have to know the gender and number of the noun/object and the French Pronouns change according to these factors:
my car is ma voiture - because the noun, car, is feminine singular;
my dog is mon chien - because the noun, dog, is masculine singular;
my books is mes livres - because the noun, books, is plural (and masculine).
As always, there are exceptions.
• When the noun (object) begins with a vowel, whether or not it is feminine, the masculine form of the pronoun is used for je, tu, and il/elle/on.
A common example of this is the word friend.
• It is the same for words beginning with h.
Here are some examples of the French Pronouns in use:
Ma maison est dans la campagne. - My house is in the country.
Ton ami Jacques arrive.- Your friend Jacques is coming.
Ses voitures ne marchent pas. His/her cars do not work.
Notre gouvernement est socialiste. - Our government is socialist.
Vos parents sont algériens. - Your parents are Algerian.
Leur idée n’est pas bonne. - Their idea is not good.