I Have a Problem With Irresponsible Pet Owners

Earlier today a cat that I really liked, that lived round the corner from me in my parents street, got killed by a big loose brindle bull mastiff type dog at lunch time.. I arrived just after it happened... The owner did nothing to stop it, the dog wasn't on a lead.. A man from British gas witnessed it and had to get the dog off that poor cat himself but it was too late.. Their other dog (a Belgian shepherd) has attacked my parents cat before and nearly killed it, and they don't walk the dogs on the lead even after that.. They murdered that lovely old cat in front of it's brother, they were two of the most friendly cats I have ever met.. The owner has had those cats since she was eight years old, she is devastated... It was just laying there.. Dead in the street.. The dogs owner wouldn't even clear it up, my mum had to.. And report it to the police.. The dog owner then took the dog to hide it at someone else's house because she knew it should be put down after that.. She didn't even put a note through the owners door or anything