Prong collars can be life-saving for some people and their dogs, when used correctly and with proper training. You NEED to get Zeus into Obedience as soon as possible, which is the top priority! Find a very good Obedience club in your area and they can even get you in touch with a great behaviorist to work on the biting issue. An Obedience instructor can safely show you how and when to use the prong collar, and help you to be able to wean him off of it and onto a flat collar with the same good results.

It sounds like there are some dominance problems going on, and neutering will help that a LOT! His personality won't be changed at all... neutering him is much safer and healthier for him, and he'll be much less distracted and easier to handle because he won't have raging hormones.

Zeus is very cute, btw! He sounds like the typical smart little Akita pup!