Properly trained, a man can be dog’s best friend.(Corey Ford – [0])
If Gracie is telling you she is done, maybe the exercises or training is too boring or repetitious for her. In my experience, I do not think Clumbers are stubborn, but very intelligent and many do not like repetition. You need to make things more challenging for her.(Gail Budde – THE CLUMBER COLLECTIVE HTTP://GROUPS.GOOGLE.COM/GROUP/THE-CLUMBER-COLLECTIVE [2010])