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LOL!
The dog and I have gotten beyond basic obedience training into agility and hunting retriever tests . . . but when we were in basic obedience it was plain to see that most of the problems were not with the dogs, but with the owners.
And I would say that 85-90 % of the problem was owners who weren't willing to take charge and be firm and consistent with their dogs. If you aren't alpha dog, your dog will take that job on, because in his view SOMEbody has to be alpha.
Thank heavens I was able to apply what I learned in 45 years of horse work to the dog . . . she's 5 years old now and my first dog, she's really turned out o.k. despite my inexperience.