Chickassan
RIP 1975-2022
You did fine, helium is a fine choice and ether will do in a pinch as well. Not a neck cracker either so Iv'e learned a few options.

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This is an unpleasant thing that many of us have experienced. I know reading unpleasant responses can be hurtful but please realize that while your pet passed in a seemingly peaceful way others that aren't aware of just how important to have the right information may find it helpful. I was glad that you were able to hold your friend as she passed.Some rather judging people on this forum… I did the best I could, with the best tools that I thought, and did my homework ahead of time. Sorry you don't like my approach, but death isn't pretty no matter what.
Hello…. I am currently trying to decide how to help my beautiful favorite hen to the rainbow bridge… she is very sick with mereks and can no longer move… she is suffering. May I ask how you felt with the mereks with the rest of your flock? Would you be willing to contact me?So sorry for your loss. I just had to put down a chicken due to Mereks paralysis recently. I also went to Dry Ice route, and didn't even hold her down ~ just made a comfy nest and stayed and watched to be sure she didn't accidentally tough the dry ice. No struggle at all, except she surprised herself a couple times with being drowsy before finally letting herself fall asleep. I used the syringe we had been using to try to get her to drink water to dribble a bit of water onto the dry ice block every few minutes, so the CO2 level went up gradually (see below). I also left her for 10 more minutes after she appeared to stop breathing to be sure. Last thing I wanted to do was to take her out early and have her come back to consciousness with in pain or buried ~ yuck.
I tried to psych myself up for the cervical dislocation, but couldn't get myself to do it. Like you, I was worried about messing it up and causing her more pain and fear. She didn't seem afraid or distressed in any way, didn't peck at the bin or try to flap or stand up. It was totally fine.
"Of those methods for euthanasia approved by the American Veterinary Medical Association (AVMA) 1, the only method that could be used safely at home involves the use of carbon dioxide. Carbon dioxide (CO2) is heavier than air and nearly odorless. In low concentrations (7.5%) it is an analgesic (pain reliever), and at medium concentrations (30%-40%) it can be used as an anesthetic, causing rapid loss of consciousness without struggling, distress, or excitation. 3 At high concentrations (>80%) CO2 causes quick death. High concentrations, however, painfully irritate eyes and the respiratory tract, so it is important to first induce an analgesic effect, then bring about deep anesthesia (within 1 to 2 minutes) before exposing the animal to high concentrations." http://www.alysion.org/euthanasia/index.html
As a Biology major and Medical Scientist, I researched the most human way, and short of phenobarbital, CO2 was the most humane. There is some research that rats will leave a high CO2 area and prefer not to stay, but 1) they aren't birds and 2) that doesn't mean they were suffering, 3) a sudden high CO2 environment is irritating, while slowly increasing CO2 is analgesic (see above). Not sure where the folks above are getting their "facts," would love some reputable sited sources. Hope it didn't scare you away from this siteFolks here second guessing and saying we should have done it their way can have their opinion, but personally I think they should have done it the way I chose...
GREAT response Mrs. K, and yes this was a very old thread but someone like me clicked it and read through it thinking similar to what you posted.I am pretty realistic, but I find the negative comments rather in poor taste. The bird was sick, the owner responsibly gave the coop de grace. She successfully dispatched the bird pretty quickly, and the bird died not panicked or highly stressed.
Each of us has to come to this in ways that we can do so. No one needs guilt heaped on them. That is not what this forum is about.
If you want to post your own post and start a discussion on the ways and means, your objections and opinions on what is best, do so. But to jump on someone who just did the best they could really misses the point of encouraging us all to be better chicken keepers.
Mrs K