UPDATE
Ok so I fallow some of you guys great advice!!
I google the info of all potential buyers, phone numbers address, name...
I book all appointments for the same day.
I call them all back to confirm the appointment to make sure they gave me their real information.
I also discreetly hold my RED PEPPER SPRAY in my hand,ready to go when I open the door.
I told one suspicious person to call just before they get here so I can put my "Pitbull" away. lol
All my puppies have been sold to wonderful families.
Thanks again for your help.
You guys are the best!!!