Why does my dog do that?
Why does my dog have one ear up and one ear down?
Last updated 23 September 2026 · How we write and check this
Short answer
In floppy eared breeds, one ear often sits up while the other flops simply because of cartilage strength, sleeping position, or how the ear dried after a bath, not because of any emotion. In prick eared breeds, a lopsided ear can briefly appear while the dog focuses on a sound coming from one particular direction.
Cartilage, not communication
Breeds like collies, some terriers, and many mixed breeds have ear cartilage that is not quite stiff enough to hold both ears fully upright, so one side often wins out over the other depending on how the dog slept or how the fur lies that day. This asymmetry is entirely physical and usually stays consistent from puppyhood, sometimes swapping sides over weeks or months as the cartilage settles.
Sound tracking in upright eared dogs
A dog with naturally erect ears, such as a German Shepherd or Corgi, may briefly rotate one ear toward an interesting sound while the other stays forward, a bit like independently aimed satellite dishes. This lasts only as long as the dog is actively listening and both ears return to matching positions once its attention moves on.
When to notice a real change
A single droopy ear that appears suddenly in a dog whose ears have always matched, especially paired with head shaking, scratching, or an odor, points toward an ear problem rather than a quirky posture.
Key takeaways
- In floppy eared breeds, one up and one down is usually just cartilage strength, not emotion.
- Prick eared dogs briefly angle one ear toward sounds while tracking them.
- A consistent asymmetry since puppyhood is typically normal anatomy.
- A sudden new droop with scratching or odor points toward an ear issue, not body language.