Dogs love sweet potatoes. My dog prefers these to store bought treats. I make treats by:
Cut sweet potatoes or yams into pieces about 1/2″ thick. [use 2-3 potatoes ]
Place cut pieces in a bowl and toss with 1 Tbsp vegetable oil [add a little more if you are not covering]
Lightly salt, mix again
Place in 200 degree oven on a cookie sheet, spreading out to make 1 layer.
Bake/dehydrate until the pieces feel dry.
Experiment with what your dog likes, leaving just a little soft makes them chewy, cooking until bone dry makes them crunchy.
If they are dry they will last longer unrefrigerated. If the potatoes are large cut slices in half. Use almost down to the tip.