Although I am in the Clearwater, Fl area for the winter. This is a wonderful platform to learn more about this breed, and you are all wonderfully generous with your knowledge. My sheltie, Kiki, is 7 months old. She is training well, and is a bundle of energy! However, there is one behavior she has had since I got her at 8 weeks: she LOVES to hip bump other dogs, and even people. I thought it might be a herding behavior, but I have never heard anyone else speak of this one. As a little pup she would also climb on top of my older dog cross-wise and just lie there. But now the hip-check is evolving into lifting her back leg and straddling. Not humping. And no, she is not in heat yet. I have seen her do this to smaller dogs. With my large dog, she loves to stand under his legs, like using him as a garage. If I sit with my legs crossed, she will back into my foot, and lift her back leg, and just stand there on top of my foot, not even touching it, really. It is so funny, but WHY?