Dog 2 has a very bad habit and that is barking at people. When I we walk both dogs together they both bark at people - dog 1 never used to do this and doesn't when by himself. Both Dogs can be told to sit when we see someone and can keep their attention with a treat until the person gets passed, which is a bit of a pain but manageable. But in the house she has a habit of lunging at people, we can get her to sit and keep her attention with a treat but she barks and lunges when she remembers. After a few minutes she's fine and all over who ever she's been barking at wanting strokes. She hasn't bit anyone but I fear she may nip someone in future? I don't think it's aggression, maybe fear? How do you tell the difference