Abstract: An assembly (2) for dispensing a liquid (4) from a container (6, 54, 58) to the mouth (8) of an animal, on demand of the animal. The assembly comprises a sealed container at least partially filled with the liquid and a valve arrangement (22). The valve arrangement comprises a first tube portion (24) adapted to pierce a portion (14) of the container to receive the liquid from the container, a second tube portion (28) adapted with an end to be used by the animal, and a valve adapted to be actuated by the animal to permit the flow of the liquid from the container to the end of the second tube portion.