It doesn't sound to me like you have to give up your dog. And I don't believe that your dog's fear issue is from breeding either. It's psychological. First, when ever you dog is scared, DO NOT cuddle him/her. This enforces the behavior. So you are petting him for being scared, so he learns to be scared. If he becomes fearful, ignore whatever it is that is making him fearful and lead him away without feeling bad. If your outside on a leash, proceed with the same action. If something scares him, just keep walking by, ignoring the sound or object. He will learn to follow your lead and ignore it as well. It is the same with aggression. If he bites a member of your family, or someone else, do not cuddle him or tell him 'its ok'. This only allows him to think that biting is okay to do. A soft, calm reprimand would be best. Specially if he is fearful, do not shout and don't get angry. Fearful dogs are harder to psychologically help then aggressive dogs, so you might want to save up money for that trainer. Also, when you were away, ask whoever was taking care of him if anything traumatic happened in your absence that could have triggered a behavior change. I believe you have a great dog that just needs a little guidance. Keep us updated!
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