Kevin Nugent's dog Orlando was attacked in Wembley last May by a 'dangerous' dog. The owner of the attacking dog carried on walking and disappeared. Orlando was rushed to the vets where they found eight severe puncture wounds to his neck.
Under new government proposals, owners of dangerous dogs could face life in prison.
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Tencho Hristov ignored warnings and got trapped between barriers at Roydon in Essex.
The 6km bike track will include 130m of the South Circular near Kew Bridge.