Cat breeds shaped by a skeletal mutation

The breeds

These breeds are defined by a mutation that changes bone or cartilage, not just appearance. That deserves the evidence stated carefully, in both directions.

American BobtailWhat the primary genetics actually show about the American Bobtail's tail, why the Manx comparison is not marketing, what one...American CurlOne Indian source publishes a price for this cat, the mutation behind the curled ear has never been found, and in 2026 the...BambinoThe Bambino is a deliberate cross of the Sphynx and the Munchkin, so it carries two mutations at once. A Dutch university worked...CymricOne tailless gene, four tail lengths, five registries that cannot agree whether this is a breed, and a welfare question the...FoldexA Scottish Fold crossed with an Exotic Shorthair, held by one registry in Canada, whose own show standard withholds awards for...HighlanderA curled-ear, short-tailed cat that TICA has held since 2008 and shows below championship, that the GCCF red-lists by name, and...Japanese BobtailA short tail in a cat is usually a welfare question. On this breed the honest answer is largely reassuring, and this page gives...Karelian BobtailA Russian bobtail from the islands of Lake Ladoga that exactly one international registry holds, whose entire indexed scientific...KinkalowA cross between the Munchkin and the American Curl that stacks a short-leg mutation on an ear-cartilage mutation, that TICA...Kurilian BobtailTen Kurilian Bobtails have had their T gene sequenced and none carried the Manx mutation. Nobody has ever tested them for the...LambkinA curly-coated short-legged cat also called the Nanus Rex, widely reported as recognised by the World Cat Federation, and absent...ManxOne in five short-tailed Manx cats carries a further congenital anomaly, and nine in ten of those are the tailless rumpy the show...Mekong BobtailThe only breed standard this cat has anywhere requires two things at once: a tail nobody has genotyped, and a tyrosinase allele...MinskinA short-legged, mostly hairless cat built from four breeds, listed by one registry of six in its Registration Only class, and...MinuetA Munchkin crossed with the Persian group, held at TICA championship since 2016, issued EMS codes by the WCF, named on the GCCF...MunchkinWhat a Munchkin cat actually costs in India, why published prices differ by forty times, what the UGDH gene does to the legs,...Pixie-bobA large woolly-coated American cat whose defining bobbed tail has been sequenced, and whose one shared allele with the Manx was...Scottish FoldWhat a Scottish Fold actually costs in India, why published prices disagree by twelve times, what the gene behind the folded ear...ToybobA cat under 3 kg that CFA advanced to full championship for the 2025-26 show season, that TICA still shows below championship as...Ukrainian LevkoyA hairless cat with folded ears, built from a Donskoy and a Scottish Fold, held at provisional class by one Ukrainian registry...

Compare the breeds side by side

To compare these 20 breeds directly, read across the table rather than down the guides. Heat tolerance is a Bonbeno rating out of 5 for Indian conditions, and the reasoning behind each one sits on the breed's own page.

What matters in this group

The points below are what the evidence on these 20 guides actually supports, not what the category is assumed to mean.

• Every page here presents the science as a live disagreement rather than a verdict, in a table of what each study actually measured, with sample sizes and sampling bias stated both ways. Some findings are damning, some are reassuring, and several widely repeated claims turn out to have no measured prevalence behind them at all.
• The breeds here are not equally evidenced, and that distinction matters more than any single finding. The Scottish Fold's TRPV4 osteochondrodysplasia has been measured and affects the whole skeleton. The American Bobtail turns out to share the Manx TBXT variants in most cats tested, which is the opposite of what the breed clubs say. And for the American Curl nobody has run the study at all: the universal reassurance that only its ear cartilage is affected traces to one sentence in a grant announcement with no sample and no radiographs, while the researchers closest to the breed wrote that skeletal abnormalities have not been reported to date and that the mechanism is unknown. Absence of evidence is reported here as absence of evidence, never as evidence of absence.
• Registry and legal positions are tabulated with dates, and checked rather than assumed. The Netherlands keeping ban that took effect on 1 January 2026 covers folded-ear and hairless cats but not the plain Munchkin, though Dutch rules do prohibit breeding a Munchkin-Sphynx cross.
• These pages are written for two readers at once: someone deciding whether to buy, and someone who already owns one of these cats, loves it, and needs to know what to watch for. Neither is served by moralising.