Should my american bulldog wear muzzle in the garden?
You must not breed the bitch or use a dog at stud.
You must not swap the dog or offer him for sale or advertise him.
Your dog must be on a lead and muzzled in all public places.
Consequently if you are following all the above rules the policeman cannot interfere with your dog in a private garden and the dog does not have to wear a muzzle on your private property.
PrecautionsTake precautions to care for your dog by checking that you are the legal owner of the dog and that he or she is registered. It is against the law to have an unregistered Pit Bull Terrier or even a Pit Bull Terrier Type. Even by enquiring with the police about registering your dog you could find he is seized.
Perhaps have a higher wall built around your property to stop prying eyes and to stop any chance of your dog straying. Also for some reason there are members of the public who will attempt to steal such dogs as they are prized for baiting and fighting.If you have a breed club then ask for their advice on this matter as they may have a canine legal expert that they call on in cases such as yours.
DEFRA can give you full advice on owning a Pit Bull Terrier or Pit Bull type and it would be in your interest and the interest of your dog to be armed with the facts in case your policeman comes calling again.