I had a very large paper route in town
I used my bike to deliver. Whe had a neighbor right down the street from my parents house with a very large St Bernard. The owner was an elderly man who tried way to hard to convince everyone that the dog was friendly and harmless. I was good with most dogs and not particulary fearful of them . On my paper route I had to be. It covered a wide area and there were lots of dogs. But when the owner wasn't around the dog would get aggressive. If we're were riding our bikes by the house we learned to pedal as fast as we could because he would jump the fence and chase us.The owner could tell I was afraid of him and ask why And when I told him he snapped at me when I attempted to deliver the paper he didn't believe. He got worse as time went on, bit me, I still have the scar 50 years later, and bit a little girl in the neighborhood and that was it. The owner had to put him down. He was too big of an animal to give any more chances to. ST Bernard's are docile until they're not.