Lessee, I've got two BIG dogs but they're unlikely to terrify anybody (Newfoundlands).
I was at IOBC (Infantry Officer Basic Course) in Fort Benning GA for the last REALLY big Miami riot in 1980. That event spread so fast because a white cop killed a black guy and the whole town was just ripe for the violence. Also it was a very HOT summer which always adds to the tension. Before you knew it (from eyewitnesses) in totally different parts of the COUNTY folks were being beset by small mobs and dragged from vehicles. One guy was near my late mom's home when a mob of thugs pulled a father and son from a car. This little kid watched as his daddy had his ears and nose sliced off his face. This was a full seven years before the now famous "Shall Issue" carry laws went into effect in the state of Florida.
Sometimes the "stay away" advice, while wise, while wise isn't too effective. Sometimes the violence and the hate just intrudes into life. For those times, especially if you're not armed for any reason, just remember you're sitting in a multi ton weapon. Use the vehicle. Don't leave the vehicle for any reason. This is one place where a heavy 4x4 SUV or Pickup really shines except the pickup without a camper shell is actually an invitation to pick up unwanted remora in a riot. Good way to get killed. These days with gas prices the way they are and getting worse, more folks are going to those TINY "Smart Cars." Dang there is even a dealership for those that sprang up near me. On the same lot as the Mercedes dealership, no less.
If you're in one of those little bitty cars and a riot event begins, you're toast. Buncha' thugs will just lift you and the vehicle into the air and toss you into a canal, or whatever. The lesson there is, ride smart but CARRY B-I-G!