Currently in New York City, only small dogs which can fit into carriers are allowed on public transportation. For dog owners wishing to travel on the subways, this can be a major inconvenience, especially when: you want to take your pet to a park that is outside of walking distance; you want to take your pet to a friend's home that is outside of walking distance; you must take your pet to the vet; or you do not have a suitable dog run in your neighborhood. While taxis are an alternative, many taxi drivers refuse to pick up passengers with dogs, and it's also far more costly than a subway ride. Allowing pre-certified dogs to ride in designated dog-friendly cars would provide pet owners with a much-needed transit option, and a new revenue stream for the MTA.