This idea is something another nurse has posted on a thread a few months ago, can't remember who it was. I tried it the other day and everyone was impressed, so thought i'd put it here for anyone who hasn't seen it before!
Get an open drip bag and inject food dye into it. Microwave it and use instead of hot hands! Stays warm for a good while and less likely to burst than gloves. The food dye is so that people know it's purpose and don't use it to flush a wound or something! I wouldn't put it in with an awake animal, but good during surgery.
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I was wondering the same as shane!