Every registered American Curl descends from one stray cat. Shulamith, a longhaired black female, turned up in Lakewood, California, in June 1981 with ears that curled backward toward the center of her skull. A single dominant gene is behind it.
TICA reports that geneticist Roy Robinson analyzed 383 kittens from 81 litters for a 1989 Journal of Heredity article and found no defects in any cross. The gene carries no skeletal disorder. The Scottish Fold is another story, since its folded ears and a bone and cartilage condition trace to one TRPV4 variant (Gandolfi et al., Osteoarthritis and Cartilage, 2016).
What Is an American Curl?
It’s a domestic cat with ears that curl backward from the face toward the center of the back of the skull, and the trait came from a spontaneous mutation.
The breed grew out of the ordinary domestic cat population in the United States, not from another pedigreed line (TICA). Registered Curls come in longhair and shorthair, and TICA calls them the “Peter Pan” of the cat world because adults keep a kitten’s playfulness.
On a show-quality ear the arc runs 90 to 180 degrees (CFA breed standard), and the ears set permanently at about 4 months of age (CFA). Any color or pattern is allowed (TICA).
Where the American Curl Came From
It started in June 1981, when Joe and Grace Ruga found two stray kittens on their doorstep in Lakewood, California.
One was the longhaired black female they named Shulamith. Her black-and-white sister Panda disappeared about two weeks later, which left Shulamith as the foundation cat of the breed.
The Rugas described themselves as casual pet owners until Shulamith’s first litter, according to CFA’s breed article (Karen O’Brien, Cat Fanciers’ Almanac, 1996). Test breedings started right after.
- In December 1981 Shulamith had four kittens, and two of them carried her curled ears (TICA).
- Jean Grimm, a CFA judge and Scottish Fold breeder, confirmed in 1983 that the cats were new to the cat fancy, and the first breed standard was drafted around Shulamith.
- The first public showing came on October 23, 1983, at a CFA show in Palm Springs, California.
- January 1984 brought the first Curl-to-Curl mating, with kittens born in March. One of them, Playit By Ear, became the first known homozygous Curl.
That makes Shulamith the ancestor of every registered American Curl (TICA).
CFA’s article also records reports of feral cats with similar ears in several US locations and in Australia.
How American Curl Ears Develop
Kittens are born with straight ears. The curl starts within days, the ears stay tightly rolled for about six weeks, and they settle into their permanent shape around four months, according to CFA.
The start date depends on who you ask. CFA gives 2 to 7 days after birth, while TICA’s breed page says 2 to 3 days in one passage and 3 to 5 days in another. A window of 2 to 7 days covers both registries.
Kitten Ear Timeline
- Straight ears at birth.
- Sometime between day 2 and day 7, the ears curl back into a tight “rosebud.”
- Around 6 weeks the transition phase begins, and the ears unfold and curl again in varying degrees.
- By about 4 months the ears are set, and breeders grade the kitten as pet, breeder or show quality.
The ear a breeder sees at 8 weeks is not the ear the cat keeps.
What the Breed Standard Allows
CFA’s current breed standard requires an arc of curl of at least 90 degrees and no more than 180, with firm cartilage from the ear base up to at least one third of the ear’s height.
The same standard asks for moderately large ears that are wide and open at the base, with ear furnishings (hair fanning outward) that frame the curl.
A cat can be disqualified for any of the following ear faults.
- In an adult, an ear tip touching the back of the ear or head
- Straight ears
- Severely mismatched ears
- Thick ears or inflexible tips
- No firm cartilage at the base
The cartilage in a Curl’s ear feels like a human ear. It stays firm to one third of the height at minimum and often to two thirds, while the top third stays flexible (CFA, 1996).
That firmness is also why the ears should never be forced into a position, since the cartilage can break. An earlier PetMD breed profile stated that the ear shape does not affect hearing.
How Is the Curl Gene Inherited?
One copy of the gene is enough to curl a cat’s ears, because the trait is autosomal dominant.
Roy Robinson, an English feline geneticist, confirmed this by analyzing 383 kittens from 81 litters and found no defects in any cross, in a 1989 Journal of Heredity article summarized on TICA’s breed page.
| Pairing | Curled kittens | Note |
|---|---|---|
| Curl x Curl | All (TICA), usually all (CFA) | Registries word it differently |
| Curl x straight-ear cat | At least 50% | Domestic cat or straight-ear Curl |
| Homozygous Curl x any cat | All | Predictable litters |
Only homozygous Curls pass the curl to every kitten, whatever the other parent looks like, which is why breeders value them (CFA).
Degree of curl follows no such rule. CFA’s article says it cannot be predicted from the parents, and two show-grade parents can still produce a kitten with a first-degree ear, the least-curled grade.
CFA’s article names a second geneticist, Solveig Pflueger, who studied the mutation alongside Robinson and reached the same conclusion: a single dominant gene with no deformities attached.
Straight-ear kittens from outcross litters are not rejects. They carry the Curl temperament, help breeding programs and make good pets, though the standard disqualifies straight ears from the show ring.
Outcrossing is deliberate. CFA’s 1996 article names non-pedigreed domestic cats that closely match the standard as the only allowable outcross, and TICA’s breed page says breeders still outcross to cats without curled ears to protect genetic diversity.
American Curl vs Scottish Fold
Both breeds are known for unusual ears, but the genetics behind them differ in a way that matters for the cat’s health.
On the Curl side, ears turn backward (90 to 180 degrees in show cats), the curl starts within days of birth, and TICA lists no known genetic health issues.
A Scottish Fold cat is built differently. The ears fold forward and downward, and in kittens the fold develops at about 3 to 4 weeks (CFA). A TRPV4 variant causes both the fold and a cartilage and bone disorder, osteochondrodysplasia.
Gandolfi and colleagues (Osteoarthritis and Cartilage, 2016) tied the Fold’s ear shape and its skeletal disorder to the same TRPV4 change. No equivalent skeletal problem is attached to the curl gene.
American Curl Size, Coat and Colors
The American Curl is a medium-sized, moderately muscled cat. Adult females weigh 5 to 8 pounds and males 7 to 10 pounds, according to TICA.
Growth is slow, and VCA Hospitals puts full physical maturity at up to three years.
The body is rectangular and semi-foreign in type, with moderate muscle. The head is a rounded, modified wedge, moderately longer than wide. Eyes are large and walnut-shaped, oval on top and round on the bottom, and longhairs carry a plumed tail.
Longhair and Shorthair Coats
Shulamith was a longhair, and her third litter produced the first shorthair Curl, so both coat lengths trace back to the same cat (CFA).
Both lengths are silky and lie flat with little undercoat, which keeps shedding low (TICA). At CFA shows the two are judged together in the Longhair Division.
Colors and Patterns
Every color and pattern is accepted, pointed patterns included, which first appeared in Shulamith’s first litter (CFA).
American Curl Temperament and Household Fit
American Curls are people-oriented, even-tempered cats that adapt quickly to new homes and to other pets, according to TICA’s breed page.
They follow their owners from room to room and expect a share of every project.
They’re quiet, trilling and cooing softly instead of meowing loudly. A greeting is a gentle head bump followed by patting and nuzzling at the owner’s face. Many learn fetch, and TICA notes a habit of opening doors and cabinets, doorknobs included.
On energy, VCA Hospitals places the breed below the Abyssinian and the Siamese. TICA recommends daily play, plus cat trees and indoor perches.
Where Sources Disagree on Children, Dogs and Laps
The breed’s reputation as a family cat holds across sources, but a few details do not line up.
| Question | Favorable | Cautious |
|---|---|---|
| Lap cat? | TICA: settles onto a lap after play. VCA chart: 4 of 5 | Hill’s: not considered a lap cat |
| Children | TICA: adore children. PetMD: get along well | WebMD: supervise, play can get rough. VCA chart: 2 of 5 |
| Dogs | VCA text: welcomes dogs. TICA: cat-friendly dogs | VCA chart: 2 of 5 |
VCA’s own chart scores children and dogs lower than its own text does.
What stays consistent is a cat that wants to sit beside people more than on them. Keep an eye on it around small children, because the play can get rough.
How Long Do American Curls Live, and How Healthy Are They?
No single lifespan figure is settled. TICA lists 10 to 20 years, PetMD says 12 to 16, and VCA Hospitals says 15 to 18.
None of them cites a lifespan study, so read the ranges as breed-profile estimates, not measured averages.
The wide domestic gene pool behind the breed is the usual explanation for its health record. TICA lists no known genetic health issues.
Ear Infections and Two Readings
PetMD quotes Dr. Lauren Witter saying the ear shape traps more wax, which gives bacteria and yeast room to grow. WebMD calls the breed more susceptible, yet describes infections as uncommon. TICA adds that black ear wax is normal for the breed.
The sources agree on the risk and disagree on how often it turns into an infection. Treat the ears as the one breed-specific health task.
Weight and Teeth
Obesity is common in Curls despite their playfulness, and PetMD recommends two 15-minute play sessions a day alongside a balanced diet.
For teeth, Dr. Nancy Welborn, quoted by PetMD, advises brushing every day or every other day.
How to Care for an American Curl’s Ears and Coat
Per WebMD, the nails need trimming every 2 to 3 weeks. The coat wants one weekly brushing, and the ears need regular cleaning with a vet-approved solution.
None of the sources above gives a fixed cleaning interval for the ears. TICA says periodically, PetMD says regularly.
Ear Cleaning Routine
- Check for pawing at the ear, head shaking, odor, discharge or redness (PetMD, WebMD)
- Expect black wax, which is normal for the breed (TICA)
- Ask your vet for a cleaning demonstration, because Curl ears are more delicate than most cats’ ears (PetMD)
- Clean with a vet-approved solution on cotton balls (WebMD)
- Book a vet visit for colored discharge, swelling or lasting redness (WebMD)
Most infections respond to medication, and treatment can include trimming excess ear fur and cleaning more often (WebMD).
Coat and Nails
One weekly brushing covers both coat lengths. Shorthairs do fine with a grooming glove or soft brush (TICA), while longhairs get a weekly steel comb to lift loose hair and prevent matting (VCA Hospitals).
Nails get a clipper every 2 to 3 weeks (WebMD), and TICA advises against scissor-style clippers.
Hill’s lists care needs as moderate, while PetMD and WebMD call the routine low-maintenance.
TICA, VCA Hospitals and WebMD all list the same tasks in the end. Brush weekly, trim nails, and follow the ear routine above.
Which Registries Recognize the American Curl?
CFA, TICA and FIFe all recognize the American Curl in both coat lengths, though sources disagree on the dates.
| Registry | Dates reported | Disagreement |
|---|---|---|
| CFA | Registered 1986, provisional 1991, championship 1993 (CFA’s breed article) | Wikipedia gives 1999 |
| TICA | Longhair championship effective May 1, 1987 (Cat Fancy, 1987) | World Cat Congress says 1988, Wikipedia says 1992 |
| FIFe | Breed recognition May 2002, certificate rights from January 2003 (Cat Fanciers’ Almanac, 2004/2005) | Sources cite either 2002 or 2003, because the two dates mark different steps |
CFA’s own article and the FIFe-linked breeder accounts give the clearest dates, which makes them the safer anchors.
TICA’s date is the least settled. The 1987 magazine report also says the shorthair was still in TICA’s new breed classes at that point.
Outcross Rules by Registry
CFA allows domestic longhair or shorthair outcrosses for litters born before January 1, 2015 only (World Cat Congress comparison). TICA accepts domestic longhair or shorthair cats that do not belong to a recognized breed.
FIFe is narrower. It permits only the sister coat length, with straight-ear Curls registered as an unrecognised variety but still usable for breeding.
CFA’s 1996 article had targeted 2010 for closing the stud books to outcrosses. The cutoff the World Cat Congress lists is 2015.
The same article records a proposal to bring in the Turkish Angora, which the author rejected because its head shape, boning and musculature conflict with the Curl’s.
How the Standards Are Built
CFA and FIFe use the same ear arc limits and differ in almost everything else.
- CFA’s first standard borrowed its structure from the Abyssinian, Egyptian Mau and Ocicat standards, but it describes Shulamith’s own features.
- FIFe judges the two coat lengths separately in eleven color groups, while CFA gives color 1 point (Felis Historica, 2022).
How Much Does an American Curl Cost, and Is One Right for You?
PetMD’s 2024 breed profile puts kittens at $1,000 to $2,500.
What Sets the Price
Price depends on each kitten’s degree of curl, bloodline, type and markings, per the American Curl FAQ by Karen O’Brien, CFA breed council secretary (1995).
Many breeders release kittens at 3 to 4 months, so the ear grade can still be moving at pickup.
The Cat Fanciers’ Almanac (Dianna Clark, December 2004/January 2005 issue) sets the grades by arc.
| Grade | Ear arc | Typical use | Show eligible |
|---|---|---|---|
| First degree | 1 to 45 degrees | Pet | No |
| Second degree | 46 to 89 degrees | Breeding | No |
| Third degree | 90 to 180 degrees | Show | Yes |
If you are not showing or breeding, ask for a first-degree or straight-ear kitten. The personality is the same, and the price follows the ear.
Where to Find One
- TICA’s website lists member breeders who have signed its Code of Ethics.
- CFA’s site carries a breeder directory and a breeder code of ethics.
- Rescues exist, but PetMD says Curls can be hard to find in shelters.
When an American Curl Is the Wrong Fit
- Allergies are a concern. Curls shed little, but WebMD says a person with a cat allergy may still react.
- If the home is often empty, VCA Hospitals says an ignored Curl finds ways to demand attention.
- Young children playing unsupervised are a risk too. WebMD warns that play can get rough, and mishandled ear cartilage can break (CFA).
- Skipping ear care is a bad idea, since PetMD ties the breed’s ear shape to more frequent infections.
It mostly comes down to how much time someone is home and whether they’ll actually deal with the ears.
American Curl FAQ
Can an American Curl go outside?
Yes, but only on a leash. WebMD advises against free outdoor roaming for any cat, because outdoor cats hunt birds and rodents and risk injury and disease.
What should an American Curl eat?
A commercial wet or dry food made for the cat’s life stage, with meat as the main ingredient (PetMD). TICA describes Curls as slender cats and recommends quality food without heavy fillers, with canned food as a supplement.
How many meals a day does an American Curl need?
Kittens eat up to four meals a day, and healthy adults need two meals a day, according to PetMD.
PetMD keeps treats at or under 10% of daily calories, while WebMD gives a range of 10% to 15%.
Are American Curls rare?
Yes. PetMD calls the American Curl a rare breed, so finding a reputable breeder takes more effort than for common breeds.
VCA Hospitals adds that cat fans in Russia, Japan, France and Spain seek the breed out.
Long-Term Care for an American Curl
Long-term care for a Curl is one steady weekly routine and a vet schedule that tightens with age. WebMD recommends one exam a year for adults and at least two a year for seniors.
The order matters more than the frequency, because the ear is the one breed-specific health risk.
- Ear cleaning demonstration at the first vet visit
- Weekly brushing, with the ears cleaned regularly
- Annual exam, then twice yearly in the senior years
The demonstration comes first because every later ear task depends on handling the cartilage correctly.
This advice rests on 2024 profiles from PetMD and WebMD, verified in November 2026. A published survey of ear infection rates in American Curls would settle where those two sources split and change how often owners clean.
