So sorry to hear this
I feel terrible for you.
I agree something needs to be down. Over here there has been so many stories of dogs and small children being bitten or killed by such dogs. Just recently I had a terrifying experience where a pitbull ran towards me growling and barking and I managed to get away into my house quickly. I have grown up with all sorts of dogs but this was the first time I actually felt really scared by a dog. I felt it necessary to report this and luckilly I knew the address of the owner and dog. I just feel that these type of dogs should only be owned by very experienced people where they can be trained and not someone who thinks it makes them look hard!
I haven't taken my baby out yet (awaiting last shot) but I feel so scared to!