When we first got our Great Pyrenees puppy at 8 weeks, we hung some bells over the back door knob and rang them every time we took her out to potty. She quickly caught on because she is a doggy genius. However, she is now 14 weeks and she rings the bells whenever she wants attention. But we are reluctant to ignore her because she may actually have to potty. How can we teach her to ring the bells only when she needs to go outside?