Abstract: The apparatus is suitable to enable an animal to undergo surgery or the like. It comprises a base on which the animal is placed before being anaesthetized and a hollow bell type enclosure to be disposed over the base with the animal bound therewith. There is provided a supply for an anaesthetic substance to be introduced into the enclosure for anaesthetizing the animal and a control enabling to introduce the anaesthetic substance into the enclosure when the animal is to be anaesthetized and to stop the introduction when the anaesthetic substance is no longer required. An opening is provided in the enclosure which enables to place the animal with its head inside the enclosure thereby keeping it under anaesthetic conditions while its body lies outside the enclosure where a surgical operation or the like can take place.