Sweet Potato Dog treats. Thoroughly wash and peel sweet potatoes. Slice the sweet potato into ¼-inch slices. You can also cut down the middle lengthwise and slice into ¼-inch strips. Dehydrate at the highest setting—145 to 155 degrees—until done, about 6 to 8 hours for a chewy texture. For crunchier treats, dehydrate longer until they have the consistency you like.