Fenrir ni Tensei Shita Hazuga Doumitemo Shiba Inu: Shiba Inu (Saikyou) ni Natta Ore, Mofumofu Sare Nagara Kami e to Nariagaru

Taro is a dog lover who is overworked at a black company. One day, Taro got hit by a truck while trying to save a wolf-like creature that was about to get run over, and loses his life in the process. Taro wakes up in another world, and the Goddess gives him the right to be reborn as Fenrir, the strongest spiritual beast, with the power of a god. However, due to the whims of the Goddess, Taro is transformed into a cute (but powerful) creature that is "Fenrir" on the inside but "Shiba Inu" on the outside. He is sent to a humble princess who prayed to Fenrir, the divine wolf, believing him to be the messenger of salvation.

"Am I really that strong?" Unconvinced, Taro (Shiba Inu) sets off on an adventure with the princess.
But as they travel, his true strength is revealed.

The strongest doggy can steal away the skills of the opponents he bites, on his way to becoming unrivaled! A relaxed, fluffy fantasy!

(Source: HJ Bunko, translated)