Clearly you have a liability on your hands. This dog, if you dont give him back to the breeder or put him to sleep, needs to be managed intensely. You say he's attacked 3 people. When someone says attack, I dont think of it as "oh hey nobody was really hurt". I see stitches, a new fear of dogs, etc.... If this dog is not okay around outsiders, he needs to be kept away from them. Not even allowed to interact with them. It obviously stresses him out more than he can handle.
Speaking from experience, managing a fear aggressive dog can become an extremely stressful task, especially when it lasts for years. In our case, our fear aggressive guy has been going downhill the last few years and he's reached the point that we're deciding when to take him to the vet and release him from whatever demons are floating around his head. He's 8. He's been a wreck since he was about 2. Do whats best for you, your dog and your family. Living in fear can cause a great deal of stress on your dog.
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