How Many Types of Cat Ear Shapes Are There? — A Quick Guide to Breed-Specific Ear Forms

ImmunityQ&AMeongsiljang Veterinary Advisory Board

Cat ear shapes can be broadly categorized into upright, folded, and curled types, with variations in shape and health considerations depending on the genetic traits of each breed. Here’s a summary of the characteristics and care points for each type.

What Is Cat Ear Shape Classification?

Illustration comparing three types of cat ear shapes

Cat ear shapes are classified into three types for breed categorization: prick ears, folded ears, and curled ears. The key factor is the structure of the ear cartilage. While most cats have prick ears, breeds like the Scottish Fold, which have folded ears, carry an increased risk of a hereditary cartilage and joint disorder known as osteochondrodysplasia. In contrast, breeds like the American Curl, whose ears curl backward, exhibit this trait due to genetics, but according to veterinary literature, there is no established link to joint diseases as strong as that seen in folded-ear breeds. Since health care priorities vary by breed rather than just appearance, it’s important to know your cat’s ear shape accurately.

How Is Ear Shape Determined?

A cat’s ear shape depends on how its ear cartilage and muscles develop. In upright ears, the cartilage grows straight, causing the ears to stand erect. Folded or curled ears, on the other hand, result from genetic mutations that affect cartilage structure. In particular, the folded ears of Scottish Folds are linked to a hereditary condition called osteochondrodysplasia, which affects cartilage throughout the body. This mutation is known to be incompletely dominant, meaning symptoms can appear even if only one copy of the gene is present. Therefore, ear shapes associated with cartilage mutations, such as folded ears, are not merely cosmetic traits; they require attention to bone and joint health as well. In contrast, curled ears have not been shown to carry the same risk of joint disease.

Representative Breeds and Characteristics by Ear Shape

Item	Erect ears	Folded ears	Curled ears
Representative breeds	Korean Shorthair, Persian, Siamese	Scottish Fold	American Curl
Ear direction	Stands straight up	Folds forward and down	Curls back and up
Genetic disease risk	Low	Osteochondrodysplasia (high)	Relatively low
Hearing	Normal	Normal	Normal
Special care	General ear cleaning	Periodic joint condition checks	Keeping the inner ear clean

Even within the same breed, ear cartilage condition can differ between individuals

Prick Ears — The Most Common Form

Upright ears are the most common ear shape in cats. The ear cartilage develops normally, effectively collecting external sounds and allowing natural ventilation inside the ear. - Hearing: Excellent at detecting the direction of sounds. - Ventilation: Moisture inside the ear dissipates well, reducing the risk of otitis externa. - Care: Even if there are no abnormal symptoms, it is advisable to regularly check the condition of the ears and clean them when necessary. If there are no special issues, additional care is not required. However, if your cat frequently scratches its ears or shakes its head, there may be a possibility of otitis externa or ear mites, so it is recommended to visit an animal hospital for a check-up.

Folded-Ear Breeds: Key Points to Check

Breeds with folded ears, such as Scottish Folds, may carry a hereditary joint condition called osteochondrodysplasia. This disorder affects not only the ear cartilage but also the joints in the legs and tail, which can lead to lameness as the cat grows. If you have adopted a folded-ear cat, we recommend consulting with your veterinarian to monitor joint health regularly throughout its growth stages. If you notice decreased mobility or reluctance to jump, seek veterinary care immediately.

Curled Ears — Characteristics of the American Curl

The American Curl is distinguished by its unique ears, which curl backward and upward. Kittens are born with normal, upright ears, but as they grow, their genetic cartilage structure causes the ears to gradually develop their characteristic curl. - Angle: The degree of curl varies from cat to cat. - Cartilage: Be careful not to force or manipulate the ears, as this can strain the cartilage. - Health: They are known to have a lower risk of bone and joint-related genetic disorders compared to cats with folded ears. Because the curled shape exposes the inner ear to the outside, dust and debris can easily get in. Regularly wipe the outer ear with a soft cloth, but avoid reaching deep into the ear canal.

American Curl cat with ears that curl backward

Common Care Points by Ear Shape

The basics of ear care are similar for all cats, but breeds with distinctive ear shapes require extra attention. - Regular checks: Inspect for odor, discharge, or redness once a week. - Cleaning frequency: Otitis externa is less common in cats than in dogs, and when it does occur, ear mites (Otodectes) are the most frequent cause. However, for cats with folded or curled ears that appear less open, check more often for discharge buildup. If the ears are clean, avoid over-cleaning. - Cleaning method: Gently wipe only the visible entrance of the ear using a cotton pad moistened with a cat-specific ear cleanser or lukewarm saline solution. - What to avoid: Do not insert cotton swabs deep into the ear canal, and do not aggressively scrub with irritating or harsh cleansers. Discharge resembling black coffee grounds may indicate ear mites, while yellow pus can signal bacterial otitis externa. If your cat frequently scratches its ears or shakes its head, seek veterinary care rather than attempting home treatment.

Precautions for Breed Mating

Breeding two Scottish Folds together significantly increases the risk of genetic disorders, so it’s not recommended by international cat associations. Even kittens born from a Scottish Fold and a straight-eared cat may still be at risk for osteochondrodysplasia, so it’s important to check the health history of the parents before adopting. Instead of choosing a cat based solely on appearance, please consider the lifelong commitment to their healthcare and well-being.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

One of my cat’s ears is folded. Is this normal?

Kittens may have temporarily asymmetrical ears until their ear cartilage is fully developed. However, if one ear remains droopy or folded after they have grown sufficiently, it could indicate trauma, infection, or a cartilage abnormality, so it’s best to have it checked by a veterinarian.

My Scottish Fold is slightly limping. Could this be related to their ear shape?

Yes, there could be a connection. Genetic cartilage abnormalities in floppy-eared breeds can also affect the leg joints. If limping persists for more than a day, an X-ray of the joints is necessary.

Does ear shape affect hearing ability?

There is no clear evidence that ear shape directly affects hearing. However, folded ears tend to have poorer ventilation, making them more prone to otitis externa (outer ear infections), which can impact hearing if left untreated. Regular ear care is essential for maintaining your pet's ear health.

Is it okay to manually straighten the ears of a fold-eared cat?

Absolutely not. Excessive force on the cartilage can cause damage or pain. When cleaning your pet's ears, gently wipe only the outer part and leave the inner cleaning to your veterinarian for safety.

Can you tell a mixed-breed cat’s lineage by its ear shape?

While we can make some educated guesses, it’s not definitive. Ear shape genes can change within just one or two generations, so genetic testing is necessary for accurate breed identification.

Primary vs. Secondary Veterinary Hospitals: A Comparison

Comparing Dog Vaccine Types (3-way, 5-way, 7-way): Differences and How to Choose

Pet Insurance Enrollment Timing Comparison: When Is the Most Advantageous Time to Enroll?

When to Let Go of Our Dog with End-Stage Cancer — Hospice Care and the Euthanasia Decision

If Your Dog Ate Dark Chocolate? — Why It’s More Dangerous and Risk Levels by Type

Feline Bladder Stones: Which Prescription Diet Is Right? — How Diets Differ by Stone Type

Recurrent Urinary Tract Infections in Dogs — Diagnosis and Treatment Guide by Cause

End-Stage Kidney Failure in Cats — Symptoms and Euthanasia Decision Guide

If Your Senior Cat Is Vocalizing at Night or Pacing — Symptoms and Management of Cognitive Dysfunction

If Your Senior Dog Barks at Night and Wanders Aimlessly — Key to Diagnosing Canine Cognitive Dysfunction (Dementia)

References

[1] Little SE, The Cat: Clinical Medicine and Management, 2nd Edition, Elsevier, 2022

[2] Maggs DJ et al., Slatter's Fundamentals of Veterinary Ophthalmology, 6th Edition, 2018

[3] Kunzel W, Breit S, Oppel M, Morphometric investigations of breed-specific features in feline skulls, Anat Histol Embryol, 2003;32(4):218–223