Even Dogs Go to Other Worlds, book 1
Hana Ichika et Ryuuou

In this isekai for dog lovers, an office worker is transported to another world…with his loyal canine companion!

Takumi often works overtime and gets home after dark. At least his beloved Maltese puppy, Leo, is always happy to greet him when he returns home. One day, Takumi wakes up in an unfamiliar forest…and right in front of an enormous wolf! Wait, could this gigantic canine actually be his once-little Leo?! With the help of a mysterious new magic power, Takumi will do his best to make a laid back, easy life for himself and his furry best friend!

Titre original : Isekai Teni Shitara Aiken ga Saikyou ni narimashita, book 1