Tuesday: An average schoolbus weighs about 24,000 lbs. empty (they have numerous springs, airbrake tanks, etc. to be safe with the weight of 70ish people when full) & don't stop on a dime like your average 1500 lb. car If she gets run-over (God-forbid), she'll be crushed, no matter how big a dog she is, best to keep her indoors - I tell people from the get-go to either leash or keep their dog indoors if their dog is the "chasing" kind (sadly, bus drivers barely know when they've run over an animal, dog or otherwise) - I also have dogs that wait for their "kids" at the corner of the property, but are wise enough to keep clear and wait - I wouldn't risk having my dog killed that way