Lol my great Dane full grown is 7 pounds overweight at 121lbs.I got a 140 lb American Bulldog who is very protective of me. if we are out in the yard and a strange vehicle pulls up, he will get between me and vehicle. Doesn't bark, growl or anything threatening, just stares at it. If they get out and move one way or the other, he will move with them, standing next to me, but always between me and whoever, never making a sound, just watching, Once you been to my house a couple times he won't even raise his head when they pull up,but he isn't stranger friendly
If you have a bull dog at 140, you won't have it long smh