Dog walkers have their place but walking so many dogs of such different sizes is ridiculous. Walking an eleven stone dog the leonberger, presumably as strong as a man, with 2 tiny 10 lb dachshunds how on eaerth would either get a good walk. Even walking my 2 grand dachshunds [same age and sex]is not easy as one loves to run ahead the other wants to bumble along sniffing everything she passes, even stopping for a poo, the other one needs to be reined in so the other one can do it and then I have to pick it up.... how does that work with that many dogs, and this after I assume a lengthy trip in a van to pick all those dogs up.
There is potential for any dog however sweet-natured to nip if in pain and I'd not have them on their own with a baby or toddler just in case, for their protection as well as the protection of the small people, who could seriously hurt a small dog being rough. Neither of the granddogs has bitten or even nipped when a pup. They do have occasional arguments but only between themselves and they read the body language and back off. A friend's dog of uncertain background sadly had to be put down; it very slightly raised its lip at me and I was told, he's ok, so unwisely I did and he did snap, didn't bite, he was trying, wish I'd trusted my instincts. It was a dog who had I presume in a previous life been punished for warning growls, growling is communication, the dog is saying I'm not happy, so she was missing subtle signals. How can you see subtle signals with so many dogs I wonder
It sounds like there was some tangling of leads, maybe a fall, panic with the dogs, and no way for a scared dog to remove itself from a frightening situation [as if being walked with so many other dogs was not frightening enough]
DD's other dog, a small old half-blind terrier was savaged by a pair of husky dogs being walked by the owner's daughter, they were so strong she couldn't hold them back, it happened so fast I couldn't do anything. Not huge dogs but as they are bred for pulling people around the arctic for days on end so very strong. Vet told the story of another such dog who had mutilated and killed a large dog [Poor little dog had to be put down because of the broken bones.]
A friend once told me that in her part of London, a lot of would-be tough guys got a certain type of dog because knives were illegal and that sort of dog wasn't. But these weren't dogs you'd expect to be savage like them