Wow! Would they be able to get to a vet and have him scanned for a chip? Also contact the local humane society and rescues and inquire if anyone has lost a bully recently.
Yes I'd look for a microchip ... and also look on craigs list to see if anybody has posted that they have lost their bully matching the description of the one your friends have found!!
I hope my neighbors know to do the right thing. They came to me first to make sure it wasn't mine. They really thought it was. I think they are walking it to see if the dog seems to recognize something.
This is my sweet Eva. She went missing at an accident scene where my fiance was seriously injured. The accident was on the interstate so she could be anywhere in the states by now. Have you seen her?