I used to have a tenant with a ~100 pound 8-month-old Great Pyrenees (and this woman was maybe 110 pounds). She called us one time in the winter to say that the building courtyard's sidewalks hadn't been salted and that she slipped and fell on the ice - the courtyard camera footage showed our maintenance guy salting the sidewalk about 15 minutes before her fall, and showed that the fall happened because her dog decided to charge at another dog and dragged her into a bench.