Wanwan Monogatari: Kanemochi no Inu ni Shite to wa Itta ga, Fenrir ni Shiro to wa Ittenee! Woof Woof Story: I Told You to Turn Me Into a Pampered Pooch, Not Fenrir!

Synopsis

After being worked quite literally to death, corporate slave Routa Okami's dying wish is to be reborn as the well-loved pet of a rich family. When a compassionate goddess actually grants him his wish, Routa commits himself to the lazy, carefree, all-you-can-nap lifestyle of a pampered pup—complete with a beautiful owner and all the delicious food he can eat! But as Routa grows...and grows...and grows...he realizes something is terribly wrong. With his enormous body, razor-sharp teeth, and fierce visage, it's painfully obvious that he was reincarnated not as a dog but as a giant wolf. And not just any wolf—the legendary wolf king Fenrir! (Source: Yen Press)