Yesterday, this family lost an innocent child to a neighbour's dogs. I have looked at the images posted online and identified the breed as a Rottweiler. This breed always ranks among the top five most dangerous dogs. Its a good dog in hands of a careful person. However check your neighbourhood for careless owners. From @Kigui
http://dogtime.com/dog-breeds/rottweiler#/slide/1
http://dogtime.com/dog-breeds/rottweiler#/slide/1