I just started using dry ice to kill my rabbits and it's a lot easier and faster than boppin' 'em on the head. I use pretty much the same method mentioned here but what I've found to make things faster is to put the ice in a container, (i.e. a milk jug or a pop bottle) and fill it with warm water. CO2 will be coming out of the bottle real fast and real thick. Then I put it in the cooler close the lid and pull the drain plug on the bottom. When the gas is coming out the plug I put the rabbit in and close the lid. It usually takes about 20 seconds for completion. However, make sure that the gas keeps coming out of the bottom. If it stops, check to make sure the rabbit died.
The container is nice because if the rabbit tips over the gas will still come out and it won't come into contact with the rabbit.

Hope this helps.

Terry

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