XL Bully owners caught “hiding away” their unregistered dogs face possible prison sentences while the animal could be seized and destroyed, police chiefs have warned. Under new legislation, which came into force in England and Wales on Wednesday, owners must have registered their American XL Bully with the Department for Environment Food and Rural Affairs and applied for a Certificate of Exemption. The deadline to do that passed at midday on January 31. However, the National Police Chiefs’ Council says despite “a high level of compliance” only an estimated 40,000 dogs have been registered so f…