A combination of an intradermal needle assembly and a prefillable container having a reservoir capable of storing a substance for injection into the skin of an animal comprising: a hub portion being attachable to the prefillable container storing the substance; a needle cannula supported by said hub portion and having a forward tip extending away from said hub portion; a limiter surrounding said needle cannula and extending away from said hub portion toward said forward tip of said needle cannula, said limiter including a generally flat skin engaging surface extending in a plane generally perpendicular to an axis of said needle cannula for limiting the penetration of the forward tip of the needle cannula into the dermis layer of the animal and a central aperture in the skin engaging surface that is axially aligned with the needle cannula, said limiter adapted to be received against the skin of the animal to administer an intradermal injection of the substance; characterised by; a sleeve having a slot (49, 53) therein and having said prefillable container fixedly disposed therein with said limiter slideably protruding therefrom, said limiter being movable between at least a first position, wherein said skin engaging surface shields said forward tip of said needle cannula, and a second position, wherein said forward tip extends beyond said skin engaging surface a distance sufficient to administer the substance into the dermis layer of the animal upon depression of said skin engaging surface against the skin of the animal, wherein said limiter is biased towards said first position with a spring means, and at least one catch (47, 51) engageable with the slot (49, 53) in said sleeve to prevent said limiter from moving from said first position to said second position subsequent to administering the intradermal injection, the container having a rim fixedly attached to the sleeve, said rim being disposed on an end opposite said hub and said spring means being compressed between said rim and said limiter, and a plunger having a stopper within the container and extending out of the sleeve. a hub portion being attachable to the prefillable container storing the substance; a needle cannula supported by said hub portion and having a forward tip extending away from said hub portion; a limiter surrounding said needle cannula and extending away from said hub portion toward said forward tip of said needle cannula, said limiter including a generally flat skin engaging surface extending in a plane generally perpendicular to an axis of said needle cannula for limiting the penetration of the forward tip of the needle cannula into the dermis layer of the animal and a central aperture in the skin engaging surface that is axially aligned with the needle cannula, said limiter adapted to be received against the skin of the animal to administer an intradermal injection of the substance; characterised by; a sleeve having a slot (49, 53) therein and having said prefillable container fixedly disposed therein with said limiter slideably protruding therefrom, said limiter being movable between at least a first position, wherein said skin engaging surface shields said forward tip of said needle cannula, and a second position, wherein said forward tip extends beyond said skin engaging surface a distance sufficient to administer the substance into the dermis layer of the animal upon depression of said skin engaging surface against the skin of the animal, wherein said limiter is biased towards said first position with a spring means, and at least one catch (47, 51) engageable with the slot (49, 53) in said sleeve to prevent said limiter from moving from said first position to said second position subsequent to administering the intradermal injection, the container having a rim fixedly attached to the sleeve, said rim being disposed on an end opposite said hub and said spring means being compressed between said rim and said limiter, and a plunger having a stopper within the container and extending out of the sleeve.