Isekai Teni shitara Aiken ga Saikyou ni Narimashita: Silver Fenrir to Ore ga Isekaigurashi wo Hajimetara the Comic

Takumi is a wage slave who works overtime all the time. Only his little Maltese, Leo, can brighten his day. One day, however, he wakes up to find himself deep in an unknown forest. At his side is his pampered pup...who's now a giant mythical wolf! With his silver fenrir companion and his mysterious new "Herb Cultivation" power, he'll finally have the laid-back life he's always dreamed of!

(Source: Cross Infinite World)