One could require a certain level of insurance to apply to all dogs.
As well as leash laws with big fines.
In many places in the USA, you can shoot dogs running loose.
A dog like this, IMHO, is not a "toy". To me, its a tool that can be a toy, but its always going to be a genetic tool to accomplish an instinctive task. I think a lot of folks who own dogs like this have problems in evaluating their own penis size and I firmly believe in the adage bad owner, bad dog. Im sure there are a lot of dedicated breeders of these dogs and it would be incumbent on them to screen the buyers.