Cat Breed-Specific Health Risks and Genetic Disease Guide | From Scottish Fold to Maine Coon

Understanding Feline Genetic Diseases Is the First Step in Choosing a Breeder

There is an important fact to know before bringing a cat home. Purebred cats, while possessing beautiful appearances and unique personalities, carry breed-specific genetic disease risks. This is not a defect, but rather a biological characteristic that has arisen through years of selective breeding. Responsible breeders understand these risks and work to breed healthy individuals through genetic testing and health management. This article explains health risks specific to major cat breeds in concrete detail and summarizes key points to verify before bringing a cat home.

Scottish Fold | Skeletal Issues Caused by Folded Ears

The Scottish Fold's characteristic folded ears result from a mutation in the gene (TRPV4) that regulates cartilage development. This mutation affects not only ear cartilage but cartilage and skeletal structures throughout the body.

The most serious condition is osteochondrodysplasia (OCD). Individuals that are homozygous for the folded-ear gene (both parents are Fold) develop severe skeletal abnormalities in nearly all cases. Joints become enlarged and fused, limiting movement of the hind legs and tail. It is not uncommon for cats to have difficulty walking due to pain.

Even heterozygous individuals (only one parent is Fold) may develop mild skeletal changes. For this reason, many countries debate Fold-to-Fold breeding as an ethical issue, and Scotland and Belgium have made it the subject of breeding restrictions.

Points for breeder selection: Confirm that the breeding is Fold × Straight (upright ears). Breeders that disclose X-ray examination results of parent cats are preferable. If a cat dislikes having its tail touched, this may be a sign of skeletal abnormalities.

Maine Coon | Heart and Joint Risks Specific to Large Breeds

Maine Coons, a large breed reaching 6–8 kg in body weight, require health management commensurate with their size.

Hypertrophic cardiomyopathy (HCM) is the condition requiring the most attention in Maine Coons, in which the heart muscle becomes abnormally thickened and pumping function declines. It has been identified that a mutation in the MYBPC3 gene is the cause, and genetic testing via DNA is possible. Cats positive for HCM carry a risk of sudden death, and regular cardiac ultrasound examinations (1–2 times per year recommended) are necessary even before symptoms appear.