Fresh powers to tackle dangerous dogs come into force today, which authorities hope will prevent thousands of attacks every year.
Police and local councils will be able to fine dog owners £20,000 if they fail to take action when their pet has been aggressive.
Owners could also be ordered to take their mutt to dog training classes, wear a muzzle or keep it on a lead, if a member of the public complains.
Powers will also be given to require a dog to be microchipped and/or neutered and for fencing to be repaired to prevent a dog leaving a property.
Tougher jail sentences for owners whose pet pooch viscously attacks someone were introduced earlier this year.
Owners face 14 years if the attack is fatal, five for an injury and three if their pooch hurts a guide dog.
In 2013, 6,740 people required hospital treatment for dog attacks - an increase of 6% from 2012.
In total, eight adults and 13 children have died from dog attacks since 2005.
14-year-old Jade Anderson was killed last year after she was attacked by two Staffordshire bull terriers and two bull mastiffs, when visiting a friend's house in Wigan.
Animal welfare minister Lord de Mauley dubbed dog attacks "devastating" and said the powers would help to "prevent attacks before they occur".
Postmen everywhere could breathe a little easier because of these new powers, Shaun Davis, of the Royal Mail, said: