Oops! I'm the Goddess' Dog?!

A man wakes as a stray dog in a beast tamer world. A shunned girl adopts him. He unlocks an evolution system: more love, more power. From mutt to divine beast to human form, he rises. He wins tournaments, crushes evil clans, and saves humanity from destruction. But can a former dog and a discarded girl truly become the world's last hope?