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Thank you for your question. My name is***** I have been a small animal veterinarian for 13 years and I'd like to help with your question.
In general, sulfur primarily causes stomach upset if it is ingested. In large quantities it can cause some other problems... Including loss of balance and an irregular heart rate... But that would require a larger quantity than I would expect he could use on a nose.
What form was the sulfur in? Was there something else in it or was it just elemental sulfur?