I think that a dog does need training in order to be well-cared for. However, I would not want the law to determine what training, to what level of training, etc.
No a dog who potties all over the house and has no boundaries whatsoever is not well cared for. It is neglected.
Just like a child who punches his mother and demands to have everything he wants and gets it. That is serious neglect, if not abuse. The child is not happy. A child needs to have limits and boundaries to feel safe. They need to know what is expected of them and are happier in a situation where there is discipline, because one who does not discipline their child, does not love their child. I am not talking about beating a child, but discipline.
Dogs are not children, but they too require limits and boundaries. Allowing them to just exist, and never curbing them, never giving them any training would probably have them seriously on edge. They would feel they must be the leader as no one else is doing it. Such a dog would be likely to have issues with aggression because he has to make decisions that he is not equiped to make. If a stranger comes in to the home, a guest of the owner, the dog would have to decide for himself if that person is a threat, or is ok. And some dogs would decide the former and do all in their power to drive them off.
Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.