If you go on vacation do not leave your bully at a kennel that you have not investigated and has a good reputation. Preferably leave your pets with a trusted friend or family member!
Never allow a stranger to handle your dog. They can run away with them very easily, especially puppies.
Do not tell strangers that you own a bulldog.
Do not tell someone who sees you walking your bulldog where you live, no matter how nice they seem.