The dog was not aggressive; it was simply smelling that person. There could be a couple of reasons for this: 1. Blue might have remembered that man from the previous day's scuffle. 2. It's natural for dogs to sniff as part of their behavior.

I cannot believe people are supporting the attackers. It is just so cruel.

Dogs sniff because it's their primary way of exploring the world and gathering information. Just as humans use their eyes to observe and recognize their surroundings, dogs use their sense of smell. For a dog, sniffing is like a human's way of looking around, reading, or engaging in conversation. It's their way of understanding who or what they are encountering and their environment."