I hate harnesses but I realize we need one. Summer walks behind me and her leash often gets tangled under foot no matter how hard I try not to. Today we were at the park and I tripped over her leash and it jerked her pretty badly. Now we're home and she's obviously sore on her neck. I feel awful. I just don't think I can walk her on a collar again. What's easy on and easy off and not likely to rub her? I want something she can very comfortably run full out in.