Animal's Become Human
With humans all gone and the pet's remained and buried their deceased owner's. All of the animals remembered their owners. Eventually they gained the ability to speak like a human being from memories of their emotional support humans, going on to being able to walk stably on two legs. They began to take on a similar appearance to that of their old owners while staying in their own specie's. Eventually they began reading to their kid's. Humanoid animals all around. Bringing a new age of peace and prosperity.