What happens to an animal in a CO2 chamber?

Using a CO2 chamber for euthanizing animals leads to loss of consciousness and death within a short period, typically around five minutes. The mechanism involves the animal inhaling carbon dioxide, which causes respiratory distress, leading to unconsciousness and ultimately death. The method is considered to induce a relatively quick demise, minimizing suffering.

Immediate paralysis does not occur initially as the animal still has the ability to move and breathe for a short time after exposure begins. While some methods of euthanasia can aim for a state of suspended animation, CO2 asphyxiation does not lead to this outcome. Furthermore, the design of a CO2 chamber prevents animals from escaping once they are inside, meaning that escape through struggling is not possible. This method aims to ensure that the process is humane and efficient.