Slightly off topic, but a dog's default state is not friendly to everyone, harrasment/abuse is certainly not required for an unfamiliar dog to be unfriendly. It

Slightly off topic, but a dog's default state is not friendly to everyone, harrasment/abuse is certainly not required for an unfamiliar dog to be unfriendly. It has taken a lot of work to domesticated them, but many dogs are only friendly towards humans through exposure and positive reinforcement.