An apparatus (10), a system (200) and methods (300, 400, 500, 600) are disclosed in relation to the configuration and compatibility of a removable delivery section (12) of the apparatus (10), and delivering a substance via the apparatus (10) to an animal. In an aspect, there is disclosed a hand held apparatus (10) for delivering a substance to an animal, the apparatus (10) including: a removable delivery section (12) including a delivery arrangement (14) adapted to deliver the substance to the animal； and a drive section (16) including a drive arrangement (18) adapted to actuate the delivery arrangement (14) in a coupled condition in which the removable delivery section (12) is coupled to the drive section (16). The delivery section (12) includes an electronic device (75) adapted to communicate with a control system (200) associated with at least the drive section (16) in the coupled condition, the electronic device (75) being configurable so to be readable by the control system (200) such that the control system (200) is able to identify and operate the removable delivery section (12).
