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Hello Davida, It sounds like there might be some underlaying leadership issues so I would recommend checking out the relevant lessons in the behavior course to make sure you have a good understanding of how leadership plays into aggression. In order to diagnose the aggression when you are on walks you should ask questions like, What is the dog’s body language when this aggression occurs? Are her ears forward or back? Where is she holding its tail? What sort of vocalizations is she making? If she is barking is it a deep tone or higher pitch whine bark? If you are able to post a video we can all analyze it together to help you diagnose whats happening. As far as the aggression in the yard and the friendly neighbor dog is concerned I think you might find the barrier frustration pages very interesting. Barrier frustration is also one of the possible explanations for the behavior when the dog is on leash, we need more info before we could say one way or another.
