For so long I've been struggling with keeping the prong collar to stay at the top of my dogs neck. It just keeps slipping down no matter how tight it is. I don't want to put it too tight because them my dog starts making noises with her breathing and I feel like it's too tight on her. Is it because she has long fur and it helps the collar to slide down her neck with ease? It's frustrating because I don't want it to harm my dog when it pulls at the bottom of her neck. How do I get it to stay up??