I've put several animals down, from diary cows to deer to cats. If you can get them to stay still long enough, put the barrel of a 5 inch of long bbl 22lr in its ear lined up with the ear canal. They drop instantly without a whimper.
If they won't stay still, I've found the 38spcl round nose lead bullet to the back of the head just above the neck does the job too. It is a little messier, but it's kind to the animal.
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