[uberglamorous]

Although it seems that you've put in some effort into enforcing discipline, your dog appears to need more obedience training. From what you've described, he has aggression issues.

First of all, you need to assert yourself more as the alpha dog. A stronger sense of respect for your authority will prevent him from acting inappropriately (barking at other dogs).

Ideally, he should know when to stop after you issue a verbal reprimand. being the dominant figure in his life begins at home. This means, making your dog wait behind you when walking through doors.

Also, never allow him to beg at the table nor feed him scraps of food off your plate. More importantly, never allow him to jump all over you or let him sit on the bed or couch.

Furthermore, you need to step up your efforts in socializing him with other dogs and people. He needs to have more frequent contact with the people in your neighborhood as well as their pets.

You can even set-up play days with fellow dog owners so your pets will be acquainted with one another. I'd also like to point out that puppy classes are a very good step in this direction, so please carry on with that.

Finally, you can seek resources on how to do proper obedience training. It will be much easier to discipline him once he gets used to following basic commands from you.

I hope this information gives you a general overview on what needs to be done to improve your dog's behavior. Remember, the key to progress is consistency. That's the only way a dog will develop the right habits.