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Hi. Welcome to Just Answer. My name is***** How long has Archie been a member of your family? How is potty training going? Is he mainly an outdoor dog?
It sounds like he's being a pretty normal puppy. They can be pretty challenging in the first couple months as they are maturing mentally and physically. It needs to be understood that they require training as they are learning each and every day what is acceptable and what isn't. If he's making progress on the potty training, then that is good! It shows that you're doing things right and that he's able to be taught things. I would have high confidence that with persistence and patience on your part that he can be molded into a very good companion. As far as the separation issue, here is a great link on what to do there.
As far as the potty training, the absolute biggest mistake I see with owners here is the puppy being allowed to be out when not supervised. If they aren't going to be watched, then they need to be crated. I'm an absolute supporter of crate training.