You could try covering Mickey's existing litter with cling wrap. He may try to dig at it a bit but most cats will still go on it, and then the pee pools in the folds, where it's fairly easy to poor into a container. It won't be a sterile sample by any means so it isn't suitable for a culture, but the USG info should still be valuable.
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"To close your eyes will not ease another's pain." ~ Chinese Proverb
“We must not refuse to see with our eyes what they must endure with their bodies.” ~ Gretchen Wyler
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