Back when Francis could see his fur used to rise when he saw very large dogs but he never growled or attacked. Then he went blind and he now uses scent to figure out friend or foe. His best friend in the world is a sweet, dear old brindled Mastiff named Nero. One time Francis was gambolling through the park and he walked completely under Nero and sure did a double take when he caught wind of his buddy. Cool old Nero just placidly watched Franny traipse through his legs and didn't even bat an eye.