I have a 5 year old coonhound and lab mix and he’s alway been an amazing dog and he’s super intelligent. But I went away for college and found my wife and had a child and unfortunately he’s stayed with my grandparents for 3 years. I just bought my first home and finally got to a point that I can give him the care and attention he deserves. This is my third day with him in the house with the family and he constantly whines and whimpers and has an absolute come apart when I leave for work. He howls for nearly an hour afterwards. I have a thunder shirt and cbd treats for him already and help a little but doesn’t quite smooth him completely. What else can I do?? Also any tricks to keep him from trying to dart out of the door every time someone opens it??