Like Wolf said it is hard to offer advice without actually observing the situation, but here are a some things that you may need/want to look at as well. First off is are you sure that you have established dominance over Olly? Some of the things you deescribed usually go hand in hand with a dog that does not completely respect the authority of the owner. What did you do to socialize him as a young pup? Dogs that are properly socialized generally do not have issues like you are describing. If it is not stemming from proper socialization then you are looking at a hard/sharp tempered dog. It could also be a phase that he is going to go through as part of his emotional maturation and over time and with proper handling he will mellow. The other thing is you mentioned him needing a job. A simple job that you can give him would be to walk him and have him either carry a backpack with some weight in it or have him pull a cart. You also mentioned having issues with leaving him home alone. A tired dog is not a problem dog. If you exercise him good before you have to leave him at home you should eliminate the issues you have described. If you do not have time to take him for a good long walk before you leave for the day, then I suggest investing in a treadmill of some sort that you can put him on for at least 20 minutes to tire him out before you have to leave him alone. I can't imagine having to part with a dog. Hopefully with a little bit of hard work you can turn Olly around and be able to keep him with you.