I think that perhaps previous issues with this dog being badly trained, exacerbated by the fact it’s very large, probably coloured the language the first post.
The slipping of the collar can happen to any size, and there but for the grace of god etc…
But you do have my sympathies. There is a dog locally that I feel similarly about. Some sort of v large mastiff cross. Dog aggressive, poorly trained and handled by a slight woman who struggles to contain it. I was nearly involved in an accident caused by them a few months ago.
I was walking along the pavement with my dog (30kg show bred lab- so not a small dog, but she looked tiny in comparison, it is several inches taller than her and very stocky). We walked past their house, on a loose lead completely under control, minding our own business, with my 8 year old son with us. We didn’t initially see them until the owner gave a startled scream as her dog lunged at us. The other dog saw us and started barking aggressively and was dragging its female owner towards us. It shot forward so quickly that her female friend also grabbed its lead to try and stop it/slow it down, and it continued to drag them down the short path and onto the pavement. My dog, child and I had to lurch sideways into the middle of the road to get out of its path, the two women still attached and ‘skiing’ behind it until they managed to stop it on the public pavement.
It was really pretty scary and if there had been a car coming there would have been a nasty accident. Yes, the issue with the dog was it was not under control/poorly trained, But if it had been a cocker spaniel it wouldn’t have been able to get so close as the petite adult woman would not have been dragged over.
I was really quite shaken up after and would have probably called it a monster too. So sorry @ClapperHam , I can understand why you might have sounded anti large dog, because you were shaken up.
There are a family of dashunds that also live in the village and equally go bonkers at the sight of other dogs, aggressively barking and straining at their leads to get to any other dogs. Evidently they have the same issues as the mastiff type dog, but they are less of a public menace as even the four of them all going for it are not enough to pull their male owner over, their smaller size means that he is not at risk of being pulled over.
I hope the young driver is ok and the police sort the matter.