A portable pneumatic stunner for stunning or euthanizing an animal has a piston slideable within an inner chamber, a housing with a front portion being moveable toward and away from its rear portion, a stunning rod driven by the piston forward towards the front end of the housing, a catch system for alternately holding and releasing the stunning rod, and a regulator for regulating the pressure received from a fluid container for operating the stunner. The stunning rod is driven along a longitudinal axis upon exposure of a pressurized fluid to the piston, and the stunning rod is retracted back into the stunner after firing by exerting a manual inward force on the stunning rod and housing. The catch system comprises a plurality of arcuate sections substantially forming a cylinder. The regulator determines the allowable pressure levels of the fluid the stunner is subjected to.
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