J'avais des chats [avant]. The [avant] (before) is optional, as the use of the past tense "avais" implies that you don't have them any more.
You would say "J'ai trois chats" in French to express that you have three cats.
vous chats
galerie des chats
j'ai trois chats.
You can say "Elle n'aime pas les chats" in French to express that she doesn't like cats.
les chats sont formidables
il ya deux chats
'I have two cats' is spelled " j'ai deux chats " in French.
"... is called Leonie" is "... s'appelle Léonie" in French.
Blusher (cosmetic for the cheeks) is commonly called 'blush' in French. If you want to use a perfectly French equivalent (barely used in French conversations), it can be called 'fard à joues'.
l'anniversaire de mon chat est le ...
je n'aime pas les chats