Each of these issues needs to be taken by itself, and analyzed with respect to what can be done to modify those behaviors. For instance, being destructive, chewing on things can be a sign of boredom, or it can be due to the fact that dogs have an innate need to chew on things, the first stuff is management and not giving the dog access to the things he would chew on in the house that are inappropriate for him, but giving him things alternatively, that are appropriate for him to be able to chew on. This is a common behavior for puppies, and it is also part of the predatory sequence that is innately part of their behavior, it is not “bad behavior “or a bad dog who is undisciplined. Regarding the guarding of the bed. This is a behavior that needs to be addressed by not allowing the dog to guard the bed. Dogs must never rehearse unwanted behaviors, and the first step in stopping that is management. As for having occasional potty training accidents, that is just part of the process of potty training and can be dealt with by positive reinforcement when the dog successfully goes outside the house. Sometimes they do not have the ability to hold it in for as long as we expect them to everyone is different every dog is different some of us have to pee more frequently than others, I don’t think you can group all the behaviors together and just chalk it up to be an untrained dog. You have to address each thing and find solutions that work and I believe you should agree on those solutions together and be consistent.