That is the new romance. Not a princess and a prince. But a woman, her dog, and the man smart enough to realize they come as a set. And to that man, we say: welcome to the pack. You’ve passed the only test that matters.
This is narrative gold. It introduces the hero not at his best, but at his most vulnerable. How does he react? Does he shout? Does he flinch permanently? Or does he laugh, wipe the mud off his face, and ask, “What’s his name?” The audience knows immediately. The dog has just performed a more efficient character assessment than a first date ever could.
For centuries, romantic storylines depended on a woman’s social and economic reliance on a man. Jane Austen’s heroines needed estates and incomes. But today’s heroine has a 401(k), an apartment, and a dog. The dog is the symbolic representation of her complete, pre-hero life.