Celui or le mien

Question

J'aime ton chien mais je préfère ________ que j'ai adopté. I love your dog but I prefer the one I adopted.
celui (program correct response)
le mien (my response)
So given this question, I chose «le mien» since the questioned required a typed in response but the correct answer according to the program is «celui»; however, to me «le mien» is also a correct response.
Can you please explain the reason it would not be correct?
Merci en avance.

Aurélie Drouard · Accepted Answer

Bonjour Ron !

Actually "le mien" means "mine" in French, so here, it sounds wrong, just like "I love your dog but I prefer mine that I adopted" sounds off in English.
You could however say "J'aime ton chien mais je préfère le mien."

Here is a link to our related lesson:
Le mien/le tien/le sien/etc = Mine/yours/his/hers/its (French Possessive Pronouns)

I hope that's helpful!
À bientôt !