About an hour ago. The situation went like this:
Puppy runs up to 3 dogs. The owner of a large leashed, muzzled dog shouts out for me to attach my puppy. I call my puppy but she keeps running (she usually has very good recall, but this time the excitement of seeing other dogs wins). Puppy rolls on her back in greeting (always very submissive). Muzzled dog sniffs, then lunges. Big friendly boxer dog intervenes to shepherd puppy away from mean dog. Puppy hurtles back to me. No harm, not even a huge fright.
Owner of muzzled dog, acting cross with me, says: "I can't always hold her. You've got to keep your dog attached."
Owner of friendly boxer dog says: "It's true, she's very mean and [owner] has a lot of trouble with her. She can be dangerous; [owner] is forced to keep her muzzled and leashed at all times."
I say: "If your dog is mean and you can't hold her, then go somewhere else where there are no dogs and no people."
Owner of muzzled dog says: "Next time I'll set her loose, just wait and see."
She grumbles some more and leaves with her 2 dogs. Me and the owner of the boxer remain; boxer's owner makes excuses for muzzled dog's owner: "Well, she has to be able to walk her somewhere."
I realise about 2 minutes too late that my puppy (or me? not clear) have just been threatened with physical aggression.
I am very angry at having been threatened with physical harm.
I am also pretty concerned that a mean dog has an (aggressive) owner who by her own admission does not consider herself capable of controlling her dog. It's not the dog's fault, but with her character, and the owner she has, this sounds like an accident waiting to happen.
Do I tell the police? I suspect she may be known to them, since it is likely that the dog is kept muzzled by some kind of official decree rather than by the owner's choice. But I have some trepidations: muzzled dog's owner does not seem terribly reasonable and might up the ante on her aggressiveness towards me and/or my puppy. On the other hand, since leaving an abusive marriage I am developing a zero tolerance approach to threats from bullies.
I am not in the UK, btw, so there is no such thing as dog wardens or the like here.