Quote Originally Posted by gandalfdagrey View Post
Just to throw another .02 into the discussion. I've read the AVMA doc and the arguments here from both sides. The reality that I see is that with either method, dry ice or co2 canister, unless performed in a controlled environment (read laboratory) where gas levels can be accurately monitored, neither method is acceptable to the AVAM. As stated in page 6, the criteria point 3 & 11 is looking to reliability and maintainability of the method of euthanasia. Both methods are “hit and miss” when it comes to CO2 concentrations as even with a CO2 canister with a reliable and accurate regulator you have no way to determine CO2 flow rate other than by look, feel, sound and your gut instinct. (Since the air in the container is not visible and the CO2 in the tank is not visible). Quite frankly I would say the CO2 canister method has the greatest chance of causing pain/harm to the animals being euthanized because of the possibility of very high rate of gas flow (Read your sight/ears/gut are not the best scientific instruments for measuring invisible gasses).
All that said, I would have to commend both sides of this argument for their personal desires to be the most humane pet owners they can be. I know I don’t like the idea of an animal having to die so that another can live, but that is the way of life. (I say this as I ponder getting a hamburger or a beef Burrito for lunch )

flow rate is probally one of the most invalid arguements period! first of all you can calculate how many ppm you are working with how fast or slow it gets there doesnt matter. actually the faster is typically better since they wouldnt have the effects of the gas until its overcome them. the only reason why gassing them period works is because its concentrated and they have been exposed to ppm that is fatal.