What does it mean when a Dog has one ear Up and one Down? Is it a matter of concern?

What does it mean when a Dog has one ear Up and one Down

Dogs are unique creatures in the world. Dogs have several distinctive traits that categorize in a separate line such as faithfulness, smelling power, recognizing ability, and last, but not the least is, a supreme hearing range. Predominantly, human’s ears are generally don’t move independently and wiggle, human ears are unable to produce the liberal motion.  … Read more