I think my Shih Tzu is having allergy issues. How can I tell?

My 5yr. old (approx) rescue Shih Tzu has a terrible odor that seems to be coming from his nose or eyes? He sneezes fairly frequently right now, but he has always had the odor. Is it safe for me to give him some childrens benedyrl and if so how much. He weighs 10 lbs. If it is not allergies, what could it be? Thanks!

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