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Is this the friendly guy who owns the dog who likes to visit neighbors?

I don't know of any way to find out if he has an LTC, but a threat is illegal, and a complaint can be filed. However, it won't disarm him. If he is making threats, and armed while off of his property, I would contact the local LEO.
You say he was arrested for DWI, that can get his LTC revoked if he had one. His arrest record can be obtained through a FOIA request, if he was charged with UCW, then it would more than likely mean he did not have an LTC.