LOL! I walk all Newfs on lead anyway...except Addie, and she isn't going anywhere without us. hahaha But we only walk around our property. I would never walk a black dog without a lead around here at night.
We used to walk Cole (Newf) and Benny (Golden) every night. Benny without lead. HOWEVER, he got stubborn about coming when called, and we couldn't see him, so we got him a flashing collar. It worked, but it's annoying to turn on and off. ha!