Yasashii Kazoku to, Takusan no Mofumofu ni Kakomarete. - Isekai de Shiawase ni Kurashimasu

One day, an unfortunate incident causes an elementary school student, Yuki Takahashi, to pass away. Before he realizes, he finds himself in a space where God exists, and is told that he will start a new life in another world. Reborn into another world with his fluffy dog (a Fenrir), Yuki ends up living in the home of the leader of the knighthood. Here, he meets many warm, kind and fluffy people. His happy life in this new world begins now!

(Source: MangaPlaza)