$50.00 for a probing??? Wow. You should learn how to do it yourself for future knowledge. The owner will always be more careful and gentle (I would hope anyway).
I would ask for a refund. See if your new vet can print up something saying the most likely cause was trauma to the vent area.
Follow your vets instructions and an added safety measure would be to rub a tiny bit of bacitracin on the area once or twice a day.
Sometimes a breeding male can get a red and irritated vent. This always clears it right up for me.
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