I could not believe it when I first saw it. That is because it has been banned where I come from. I read about - in "Black Beauty" by Anna Sewell. A Victorian novelist and activist against cruelty to animals. Which the British really care about. It is a Royal Society for the Prevention of Cruelty to Animals - not for the similar one for children.
Rotweliers and Dobermans are breeds popular with people who like their dogs to be agressive. There is even a disgusting practice still here of operating on dog's ears to make them stick up and look sharp and pointy. I doubt you could find a vet in most countries willing to consider such mutilation for no good reason at all.
There are some very sick puppies out there - and they are human, not canine. There is nothing wrong with dogs - but there is a lot wrong with some of their owners.
And the sooner these practices are banned here the better.