a brown and black attack dog being trained by a man holding a stick
A blind man is attempting to train his dog to ward against intruders.
The man holding a stick does not indicate that he is blind. The dog being trained to attack does not imply a ward against intruders.
Just because a man is holding a stick doesn't imply that he is blind. The fact that an attack dog is being trained does not mean it is being trained to ward against intruders.
The man may be training his dog or someone else's dog; he may be training the dog to ward against intruders or he may be training the dog to not attack friendly people or training dog to do or not do any number of things.