I witnessed a man let his dog terrify a woman to the point of standing on a park bench screaming and trying to fend it off with her shopping trolley.
He looked amused.
The dog was in a "friendly" bouncy mode, rather than aggressive (scant consolation to her) but he should not have let the dog approach into her personal space let alone continue. I heard the kerfuffle before I got round the bend and saw it. It was not resolved ASAP.
I do wonder if a level of racism was involved.
As I approached, I told him that he was breaking the law and committing an offence by allowing the dog to terrify her and the dog was legally out of control so put it on its lead. I deliberately went for the pompous, assertive approach, and fortunately that did throw him a bit because I was clear about the law.
He paused for a moment as though he was going to argue back but decided on a token gesture of putting the dog on the lead, and humouring the silly little woman challenging him (I am small!). The terrified woman was still watching on the bench having not stepped down yet.
Once the dog was on the lead, I ran on pretty quickly to get away incase he changed his mind and got funny.
Naturally 5 minutes later I saw him with his free range mongrel designer dog roming around freely. Quel surprise.
He really did not give a shit about how much he'd let his dog terrify her.
At least I had warned a (female) dog walker with a "give space" lead to give him and his dog a wide berth before that point. She thanked me as she decided to leave the path and go cross country.