Quote Originally Posted by Pythonfriend View Post
if you use gas, i would advise against the use of CO2.

its rather quick, but when mammals detect a CO2 increase in the blood stream they react with panic and a feeling of asphyxiation before they die.

i think its more humane to use a gas that prevent such a CO2 buildup.

nitrogen or helium is much slower, but since there is no CO2 buildup they fall asleep peacefully.

optimal would be nitrous oxide / laughing gas. super fast and super painless, it knocks them out within a few seconds and they feel euphoria. you can cheaply buy single-use cartridges that are usually used in whipped cream dispensers. its legal to own as long as you dont use it as a drug.

edit @ tribal: i think its the mass murderer clown from the Rob Zombie movie "house of 1000 corpses"
Why are you always spouting this off? CO2 and Cervical dislocation are the only two methods approved by the vet boards for humane, in-home euthanization of small animals. You don't just pump in a killing dose of CO2 right away. You start off small and slowly introduce it. The rat will calmly fall asleep at which point you crank it up and kill the rat. No stress, no panic. Also, so far as I know... the whipped cream cartridges are also CO2.