as a bulldog owner, i would'nt worry about him. mine thinks she runs the house,once in awhile lots of posturing and an occassional grumble. but most are wimps, she runs for cover at a raised voice. this breed is very sensitive, he's probably a little edgy, due to his blindness.

i would contact the owner right away as these are very expensive dogs. if anything ever happened to mine, i pity the person as they would have to deal with my wife