I will be picking up a puppy mill foster this weekend, my 1st. I have a 3yr old Cav that has been with us since April, he is doing great. There are times when you can see the old insecurities creep in but not very often. I don't want to make any mistakes with either one when they are introduced. Can anyone offer any suggestions as what or what not to do so they get off on the right tract and my adopted does not retreat any.