Some of you have asked for visuals. This photo shows exactly what Fiona sees if she steps outdoors while the dog is not penned or chained. I took this from Fiona height. I discovered when taking photos that the instant I squat to Fiona-height, I become the target of one of these charges. You'll need to click on the photo and view the larger image for the full effect. Imagine the image moving towards you faster than you can run away. Imagine that the image weighs 85 pounds.
If you are a child who is taller than the dog, which two of the children in this family are (though one only barely), this is what you see next. Plus muck smears all over your shirt.
If you are one of the unfortunate family members who is not taller than the dog, what you see next is the ground rushing up at you very quickly, and then a hurricane of fur, slobber, claws and teeth "wrestling" with you on the ground.