Quote Originally Posted by littleindiangirl View Post
However, anything larger than a mouse or rat pup is quite more difficult to kill by cervical dislocation, and in my opinion, is a lot easier to do incorrectly, which would result in an animal in severe unbearable pain. Cervical dislocation is recommended to be done by someone well trained, and can be very hard emotionally on the person practicing it.

CO2 is inexpensive, easy to accomplish with very low risk, and can be done literally by anyone without practice. You don't even need to watch the entire process as it's happening, as long as you remain there and check on them after an allotted time.

CO2 has an anesthesia effect after only a few seconds, increasing the pain threshold and making the animal drowsy. This is seen as humane for the animal.

My .02 cents.
But at the same time you are suffocating the animal. Have you ever seen the first Resident Evil movie? In it the Red Queen/computer locks some of the people in a chamber and fills it with CO2 to suffocate them and quite frankly I would rather die by being smacked in the neck with a ruler( If I was a rat) Then again I know how much you adore your rodents but honestly CO2 isn't as humane as first believed I mean.. Living things need oxygen, if you fill a chamber with something other than air what happens? They suffocate. Just my two cents nothin on ya sweetie