this is a fake story. If you read the entire write up and came here hoping to find more information then you should not worry; some of the people are retarded some of the time.
EDIT: According to an article on FT.com, 20 dogs out of a population of 35,000 have learned how to ride the subway. If you're saying that the claim that most dogs know how - which is certainly suggested by this article - is fake, then you're certainly correct.