I'm not sure specifically as there could be many stories with such a title. It might be about a dog from the city and a frog from the country and their adventures or interactions.
The dog in Toy Story is called Slinky Dog. It's a well-known and beloved character in the franchise. Slinky Dog is known for its unique and fun personality.
Obviously, from the title, it's the dog from the city and the frog from the country. They would be the central figures around which the story revolves, and the plot would probably involve their relationship, whether it's a friendship, a rivalry or something else.