Woof Woof Story, Vol. 1 (Manga)

As corporate slave Routa Okami keels over in the middle of his busy office, he imagines about how nice it would have been to live as the pet of some of rich family instead of literally working himself to death. When a goddess actually grants that wish and brings him back as a pampered pooch, Routa is over the moon! ...But wait, why is he howling at it...?