Dogs are pack animals. There's only one leader of the pack, and that should be you - not the dog. I find in most cases, the human leader backs down and isn't consistent enough, so the dog automatically sees itself as the leader of the pack.
Gut instinct tells me your dog, because of it's "gluttony", may have a mineral defincacy as well. It's "craving" something.
This is true. The timeline is that from 8 weeks to 2 years, she received consistent leadership and was a good dog, not perfect but good. From 2 years to just over 3 years, we failed to provide consistent leadership after the onset of her seizures. Our desire to control her episodes overcame our desire to maintain her good behavior. As a result, some really bad habits emerged because of our failure and, in part, because of the impact of the medication. We are now trying to re-assert dominance, but it isn't going well.