Skip to content
One ear standing while the other flops is common in puppies and some adult dogs. In many cases, it is simply part of normal development, genetics, or individual ear shape.
A dog’s ear position depends on several factors, including breed, cartilage strength, age, recent injury, inflammation, and nerve or muscle function. Puppy ears can also change from day to day as they grow.
Although uneven ears are often harmless, a sudden change in an adult dog can sometimes signal pain, an ear infection, trauma, or a neurological problem. This guide explains the most likely reasons and when veterinary care is appropriate.
Is One Ear Up and One Ear Down Normal?
Yes, it can be completely normal, especially in puppies and mixed-breed dogs.
Ear position may vary because:
- One ear’s cartilage is stronger than the other
- The ears are developing at slightly different rates
- The dog inherited mixed ear traits
- The dog is naturally asymmetrical
- The ear has been temporarily affected by sleep, movement, or handling
If your dog is comfortable, the ear looks healthy, and there are no signs of pain or irritation, uneven ears are usually a cosmetic difference rather than a medical concern.
How Do Dog Ears Stand Up?
A dog’s visible outer ear is called the pinna. Its shape is supported mainly by cartilage and controlled by small muscles and nerves.
Whether an ear stands, folds, or hangs depends on:
- Genetics
- Cartilage thickness
- Ear size and weight
- Breed type
- Muscle and nerve function
- Injury or inflammation
Large, heavy ears are more likely to hang, while smaller ears with firm cartilage are more likely to stand upright.
11 Reasons One Ear May Stand Up
1. Genetics
Genetics is one of the most common reasons a dog has one ear up and one ear down.
Some dogs inherit upright ears, some inherit floppy ears, and mixed-breed dogs may inherit a combination of both traits. Even within the same litter, puppies can develop different ear shapes.
Dogs with semi-prick, rose, button, or mixed ears may naturally carry one ear differently from the other.
If you are still choosing a breed, this guide can help you consider which dog breed may suit your lifestyle.
2. Normal Puppy Development
Puppy ears often develop unevenly. One ear may stand first, followed by the other days or weeks later.
It is also common for an ear to stand one day and flop the next. Cartilage, facial muscles, and the skull are still developing during this period.
Some puppies eventually develop two upright ears, while others retain one floppy ear permanently.
3. Changes During Teething
Some puppy owners notice ear-position changes during teething. This usually happens at the same time as rapid growth and cartilage development, rather than because chewing directly strengthens or weakens the ear.
The ears may temporarily rise, fall, or become uneven as the puppy matures.
Learn more about puppy teething symptoms and care.
4. Uneven Cartilage Strength
One ear may have slightly thicker or firmer cartilage than the other. This can cause one ear to remain upright while the other bends or flops.
This difference may be inherited and is usually harmless.
5. Previous Ear Injury
An injury can alter ear shape by damaging cartilage, skin, muscles, blood vessels, or nerves.
Possible causes include:
- Rough play
- Animal bites
- Scratching
- Accidental impact
- Previous surgery
- A torn or scarred ear flap
A sudden change following trauma should be assessed by a veterinarian.
6. Aural Hematoma
An aural hematoma occurs when blood collects between the skin and cartilage of the ear flap. It often develops after repeated head shaking or scratching.
The ear may appear:
- Swollen
- Thickened
- Warm
- Heavy
- Painful
An untreated hematoma can heal with scarring and permanently change the ear’s shape.
7. Ear Infection or Inflammation
An ear infection does not usually make cartilage stronger or cause an ear to stand normally. Instead, pain, swelling, head tilting, or repeated scratching can change how the dog holds the ear.
Signs of an ear infection may include:
- Redness
- Odor
- Discharge
- Head shaking
- Ear scratching
- Pain when touched
- Holding one ear lower or differently
Do not insert cotton swabs deep into the ear canal. Review these steps for cleaning your dog’s ears safely.
8. Nerve or Muscle Dysfunction
The muscles that move a dog’s ears depend on normal nerve function. Injury, inflammation, or neurological disease may cause one ear to droop or move less than the other.
Seek veterinary care if ear asymmetry appears suddenly alongside:
- Facial drooping
- Uneven blinking
- Head tilt
- Loss of balance
- Weakness
- Difficulty eating or drinking
9. Ear Cropping or Previous Surgery
Dogs that have undergone ear cropping may develop uneven ear carriage because of differences in healing, scar tissue, cartilage, aftercare, or surgical outcome.
Ear cropping is a cosmetic procedure and is restricted or prohibited in some places. It should never be attempted outside a licensed veterinary setting.
10. Ear Taping or Posting
Some owners or breeders use taping or posting in an attempt to influence ear position. Improper taping can cause:
- Skin irritation
- Restricted circulation
- Trapped moisture
- Infection
- Pain
- Cartilage damage
Do not tape or post a dog’s ears without direct guidance from a veterinarian experienced with the breed and procedure.
11. Aging and Physical Changes
Older dogs may carry their ears differently because of changes in muscle tone, cartilage, hearing, arthritis, nerve function, or previous injury.
A gradual cosmetic change may not be serious. However, a sudden droop or change in an older dog should be evaluated, especially if it occurs with pain, head tilt, balance problems, or facial weakness.
For more age-related care guidance, read about supporting senior dogs as they age.
When Do Puppy Ears Stand Up?
There is no single age at which every puppy’s ears should stand. Timing depends heavily on breed, ear size, genetics, and individual development.
Some puppy ears begin standing within the first few months, while others continue changing for much longer. Large or heavy ears may never stand fully.
It is normal for puppy ears to:
- Stand unevenly
- Alternate between standing and flopping
- Fold at the tips
- Change during growth
- Remain naturally floppy
Do not add calcium or other supplements in an attempt to make the ears stand unless your veterinarian has diagnosed a deficiency. Excess supplementation can be harmful, particularly in growing puppies.
Can Diet Make a Dog’s Ear Stand Up?
A complete and balanced diet supports normal growth, skin health, muscles, and connective tissues. However, there is no reliable evidence that a particular food or supplement will make a genetically floppy ear stand upright.
Puppies should eat a complete diet formulated for their age and expected adult size. Avoid adding calcium, collagen, gelatin, or vitamins specifically for ear shape without veterinary guidance.
If a puppy has poor growth, weakness, abnormal bones, or other health concerns, schedule a veterinary examination rather than treating the ear position alone.
Can Temperature or Humidity Change Ear Position?
Normal changes in weather do not usually change ear cartilage enough to make an ear permanently stand or fall.
Moisture, heat, or cold may temporarily affect how a dog holds its ears because of discomfort, wet fur, wind, or irritation. Persistent asymmetry is more likely to involve genetics, development, injury, inflammation, or nerve function.
Should You Tape Your Dog’s Ears?
Ear taping is not necessary for health in most dogs. A naturally floppy or uneven ear does not reduce a dog’s quality of life.
Before considering taping, speak with a veterinarian. An apparently weak ear may actually have:
- An infection
- A hematoma
- Skin irritation
- Cartilage injury
- A congenital difference
Improper taping can create more problems than it solves.
When to See a Veterinarian
Schedule a veterinary examination if your dog’s ear position changes suddenly or is accompanied by discomfort.
Warning signs include:
- Ear swelling
- Redness
- Discharge
- A strong odor
- Bleeding
- Frequent head shaking
- Constant scratching
- Pain when the ear is touched
- Head tilt
- Loss of balance
- Facial drooping
- Difficulty blinking
- Recent trauma
A sudden drooping ear in an adult dog should not automatically be dismissed as a cosmetic change.
The Bottom Line
One ear up and one ear down is often a normal result of genetics, puppy development, or natural differences in cartilage strength.
It is less likely to be caused by weather, chewing, or a simple dietary issue. Ear infections typically alter ear carriage because of pain and inflammation, not because they strengthen the cartilage.
If the difference has always been present and your dog is comfortable, it is usually nothing to worry about. If the ear changes suddenly or appears swollen, painful, smelly, or irritated, contact your veterinarian.
Frequently Asked Questions
Is it normal for a dog to have one ear up and one ear down?
Yes. It is common in puppies, mixed breeds, and dogs with semi-prick or uneven ear shapes. It may simply reflect genetics or different cartilage strength.
Will my puppy’s other ear eventually stand up?
It may, but there is no guarantee. Puppy ears often change during growth, and the final position depends largely on genetics, ear size, and cartilage.
Can teething make a puppy’s ears flop?
Owners sometimes notice ear changes during teething, but this is likely related to overall growth and development rather than teething directly weakening the ears.
Can an ear infection make one ear droop?
Yes. Pain, swelling, scratching, and inflammation can cause a dog to hold one ear lower or differently. Infection usually does not cause an ear to stand by strengthening its cartilage.
Can an injury permanently change a dog’s ear shape?
Yes. Damage to the cartilage, skin, nerves, or blood vessels can alter ear carriage, particularly if scarring or an aural hematoma develops.
Should I tape my puppy’s ears to make them stand?
Do not tape them without veterinary guidance. Incorrect taping may cause pain, infection, restricted circulation, or skin and cartilage damage.
Will calcium make my dog’s ears stand up?
No supplement should be given solely to change ear position unless prescribed by a veterinarian. Excess calcium can harm growing puppies.
Why is my adult dog’s ear suddenly drooping?
Possible causes include infection, injury, an aural hematoma, pain, nerve dysfunction, or inflammation. A sudden change should be checked by a veterinarian.
Can hot or cold weather make one ear stand?
Weather may temporarily affect how a dog holds its ears, but it does not usually create a lasting change in cartilage or ear shape.
Do uneven ears affect a dog’s hearing?
Not necessarily. External ear shape alone does not usually indicate hearing loss. Hearing problems are more concerning when paired with infection, blocked canals, neurological signs, or poor response to sound.
What does an aural hematoma look like?
The ear flap may appear swollen, thick, soft, warm, or balloon-like. It often follows repeated scratching or head shaking and requires veterinary treatment.
