I have had a border collie rescue for two weeks. I have a 6 year old lab who is reactive to most dogs, though can play with various different dogs at the kennel. They have sniffed each other a couple of times and they can walk together. I am wondering if anyone has had an experience getting two dogs together successfully when one is a reactive (also resource guarder). I really would like to keep the little border collie but not at the expense of my lab. Can someone help me?