I personally thing the CO2 is cruel and will not go into details here but I have seen it once and it still breaks my heart years later
CD is not supposed to be done on rats above 200g (which is very small), so I could not imagine it would be proper as a primary means of death for a chin that is 600-1000g.
If you read the link that was given above, it states "Manual cervical dislocation is a humane technique for euthanasia of poultry, other small birds, mice and rats weighing < 200g, and rabbits weighing < 1kg when performed by individuals with a demonstrated high degree of technical proficiency."
Gonna group chins with rabbits here. Well, most of the chins do weigh less than 1kg - though I have quite a few over 1kg here in the herd. Most of the time when you're putting animals down, the chins have lost so much weight and are so frail, that it's probably more likely that the chin will be a lot smaller than 1kg.
The thing is, most rabbits that weigh less than 1 kg (2.2 lbs.) are quite young (with the exception of Dwarf breeds), similar to a rat that weighs less than 200 grams. CD seems to be more acceptable as a method of euthanasia for young animals which don't have the strength in their musculature and skeletal systems that older animals have. I don't know that I'd attempt CD on an adult chinchilla, even if it was under 1 kg.
Oh man, Brittany...I am so sorry. I am sure he didn't feel it very long at all - that type of injury probably took away all the pain pretty fast. That's so sad and I am very sorry that you had to see that.
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