A new law named after a police dog which recently appeared on Britain's Got Talent has come into effect. Finn is a German Shepherd and retired police dog of the Hertfordshire Constabulary in. Finn's Law will make it a criminal offence to injure service animals like Finn, offering them. Its on its way Finns Law. The dog has previously appeared on Britain's Got Talent. The Animal Welfare (Service Animals) Bill, known as 'Finn's Law', will prevent those who attack or injure service animals from claiming self-.