Pets trained to bite, hold and release on command are growing ever more popular in the UK. But why – and at what cost to the animals and their owners? Pets trained to bite, hold and release on command are growing ever more popular in the UK. But why – and at what cost to the animals and their owners? E ven if you’re not afraid of dogs, you might be a little intimidated by Butch Cassidy. His tail may be wagging, but the Belgian shepherd weighs 40kg and moves with awesome agility. Even a casual