niko is right with the freezer. Freezer isn't as effective as it is with reptiles but they're so small, it'll be quick and it shouldn't suffer.
On a normal day, I'd be giving you jabs too... but my girlfriend just called me a little while ago to tell me that her 12 year old dog took an overnight turn for the worse (been on experimental Chemo for 6 months and battling cancer for 2+ years) and will need to be put down.
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