Rebel (Cattle Dog) is unmotivated by anything. Literally. She will work for food but only a few minutes, toys get a longer and better reaction, and being a Cattle Dog she could care less for petting and praising. Even so, she will not work very long before she gets bored and quits (as in walks away...which is annoying/hurtful to the training process and something I've heard of but never had to deal with when training a dog). So! Any suggestions?