Great, you have dogs.
I'm just not following why this is an Alert. You decided to host out of your private home. Everyone who has been there knows where you live. Just because you've seen someone once does not mean they won't decide to come back and do harm at a later date.
Perhaps you should consider working out of hotel, for your safety.
In any event, this Jon guy
https://www.eccie.net/member.php?u=234977 has been around for awhile, has several reviews, and had not logged on to his account since 4pm today. Hopefully you'll get a response from him soon to put your mind at ease.
Good luck!