Geez Louise Mooch! Mistaking a pug for a pitbull is hilarious! Although this is the first Lew story I've come across, and therefore probably shouldn't say anything, but I'd make nice with him REALLY fast. You might have some good times and maybe even help the guy out a bit. I've known a few Schizophrenics and a few OCD cases - they were always loads of fun!!! :)
You should tell him it's a pug. He has enough problems without thinking it's unsafe for him to walk out his front door....