because they feel insecure
They are unfamiliar with the person and seem them as a treat to them and their territory. They bark to alert their owner or defend itself from the presumed intruder.
Some will.
they see ghosts
All dogs bark at strangers, there alerting you that there is someone there, soft scolding should stop it but they do it for your safety.
Yes, Labrador just like all other dogs will bark at strangers. It will start barking when it 8 weeks old.Labrador just like the other types of dogs will begin barking at strangers when it is at least 8 weeks old.
they see in black and white
Yes, dogs do bark. They bark when they see something or when they feel aware of a presence. "Bark Bark" "woof woof" says the dog.
See a vet. This could be serious.
Black Russian Terrier are tend to be a bit aloof around strangers, including dogs they don't know, but they're devoted to their families--and they don't bark or shed much.
some shih tzus bark beacause they see strangers and try to protect themselfs but some shihtzus bark at other dogs beacuse they are scared if a shih tzu barks at you and you are its owner maybe it just wants to play or needs things like:food,water, attention, and or potty brake :)
They like to play and be playful. Dogs also want you to play with them and they are happy to see you.
I hear that dogs don't really bark at ghosts, but at the devil. Cats are the only one who could see ghosts. A dogs hearing range stretches beyond ours, which is why we sometimes do not know why they bark.