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Wait… this was allowed??

Most comments already said the most important things. For my dog, it took months to get her assured that we will return. We had a lot of success with doing a routine when we are leaving. We put her on the bed, say goodbye and then we put a snack or two next to her, which she isn’t allowed to get, while we are in the room. As soon as I am out of the room, she is allowed, so me leaving is somewhat of a cool thing to happen. Also don’t be too dramatic when you leave the dog and also when you come back. Treat it as a normal thing… it will take time but most dogs learn it after a while. Just be patient. Good luck