Puppy Training

[365seasons]

Adorable puppy! I really like his coloring.

I'm not an expert on dogs or anything, but I figured I'd share my experience, and you can take or leave what you choose from it.
My parents actually have a 7 month old boxer puppy right now, and have been going through a lot of the same thing right now, so a lot of this is fresh on my brain.

First off, neutering should help him be a little less dominant, so lets hope for the best there. Hopefully he will calm down a little. As far as the biting, and barking at you goes, you are right. He is pretty much in his teenage years and telling his parents "NO!". My parents and I have found that with Zephyr (their boxer), when the dog starts biting, to calmly say no, and go to another room, or up on a high chair or somewhere where the dog cannot bite. Usually they are doing this for attention, and regardless if you are trying to break the bad habit with techniques, it is still bad attention. So by leaving them, you are telling them that you do not appreciate that and will not tolerate it.
As well, when he barks at you when you ask him to do something, I would suggest putting him on a time out. This should not be a bad thing, where there is yelling or pulling, just a calm time out so he can calm down and realize that you are, indeed, the alpha & boss, and that that behavior is unacceptable.

Something I'm sure you've been doing already, but will mention anyways, is the reward system. Whether your dog is praise oriented or responds to food, you need to let him know exactly what behavior you like and praise him generously for it each time he does it, whether you commanded it or not (at least for now). By doing this, the dog will be trying to please you constantly because he will associate that with praise.

Other than that, he is in his teen years as far as age goes, and as long as you keep on doing what you'd been doing in the start that worked, I wouldn't get too discouraged. He should just be going through a phase and by staying constant, he will come out of it well trained. As he is an energetic dog, try working with his commands and his temper after he has had a long walk or exercise. This may just help your sanity as he will be worn out and more compliant.

Hopefully I could be of some help, and I really hope that you and your fiancee can figure out a solution for the problems you are having. He is an adorable puppy and I'm sure he will grow into a great dog. =)