Transport for London
Tube, DLR and London Overground.
16. Animals
16.1 You can bring an assistance dog with you without charge. You can also bring with you without charge any other dog or inoffensive animal, unless there is a good reason for us to refuse it (such as if the animal seems dangerous). You must keep it under control on a lead or in a suitable container, and must not allow it on a seat. Staff are not allowed to take charge of any animal.
16.2 If you bring an animal with you, for safety reasons you must carry it through automatic ticket gates. If you have an assistance dog, at stations where there is no wide automatic gate, you must ask a member of staff to open the manual gate to allow you to enter or leave a station.
16.3 If you bring an animal with you, you must use a staircase or lift where provided. If there is no staircase or lift and you need to use a moving escalator, you must carry your animal unless you have an assistance dog that has been trained to walk on moving escalators. If your animal is too large to carry, a member of staff will stop the escalator to allow it to travel on it when it is safe to do so (generally outside the rush hours and when the station is not busy).