maybe you would find this link helpful... It gives detailed instructions on how to make a home made humane euthanasia chamber out of baking soday, vinegar and some tubing, a plastic bag and a small container. This method is considereed humane by the vet association. They have done tests, including heart rate, breathing and hormones in the bloodstream during euthanasia and if done properly the animal goes to sleep. Good for animals under two pounds, NOT SUITABLE FOR DOGS, per the author.
http://www.alysion.org/euthanasia/
http://www.alysion.org/euthanasia/

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