San Francisco has a population of 805,000 in only 47 square miles. This makes it the second most densely populated city in the U.S. after New York. This is good for people visiting with dogs as it makes the city very walkable. To walk from anywhere to anywhere else in San Francisco you would not have to walk more than 7 miles. Most of the visitor areas are within three miles of each other, however. San Francisco is very scenic and has many hills some of which are quite steep with sidewalks made as stairs. There is a lot to do for a visitor with a dog in the City by the Bay.