People mistreating animals is why we had 5 cats and 1 dog at one point in time. All of our cats, and our dog, were rescues.
Our dog, Buckles, had been abused with a broom (we figured that out because she would run and hide and whimper every time I swept the floor) - plus they had snipped her whiskers!
Sneakers found her wandering around and he brought her home. She was a wonderful, loving dog - part boxer, part shepherd, part who knows what all. At 65lbs, her size could be intimidating, but she was very friendly with people.
Then came the day she and I were out walking around our block. Around 4pm, on a warmish summer day. Lots of sunlight, lots of folks around. I saw a man coming towards us, so I stepped up on a driveway and told Buckles to sit. She wouldn't sit - she stood - right in front of me. She strained at the leash and her shackles came up, and then the growl. I had never heard this sound before and it scared the tar out of me. I was afraid I wouldn't be able to hold onto her. This man kept coming towards us and I tried backing farther up the driveway. Then he stepped onto the driveway and Buckles went nuts. She barred her teeth and barked and growled and tugged to get loose. I told him he should just keep on walking. He kept talking to me and coming closer. The leash was about to snap and Buckles was ready to take this guy down, when the homeowner came out with a broom and chased the man away.
I stood there totally astonished. Once the guy was gone, Buckles was back to her happy-go-lucky self. The homeowner told me the man was a patient of a psych. doc at the corner and was dangerous. Obviously Buckles sensed the danger since she was alert long before this guy got close. I do think Buckles would have won the match, but I'm glad I didn't have to find out. I know I saw our dog in a different light after that, and never again did I ignore her warning signs. If she didn't like someone coming near us, I'd cross the street with her. I gave her snacks when we got home.