l'anniversaire de mon chat est le ...
a birthday is 'un anniversaire' in French
Birthday is "anniversaire" (masc.) in French.
You would say "J'ai trois chats" in French to express that you have three cats.
vous chats
d'anniversaire
A birthday cake in French is 'un gâteau d'anniversaire'
"Bonaniversè" is how you would say Happy Birthday in Louisiana Creole French.
you say mon gorna be mansa
un anniversaire
"Today is my birthday!" in French is "Aujourd'hui est mon anniversaire !"
you say "son anniversaire"