Domestic cat breeding has created breeds with diverse conformations and characteristics, but some breeding selection has produced genetic traits that compromise individual welfare. Understanding breed-specific welfare concerns enables informed decisions for prospective owners and drives breed reform.
Persian and exotic shorthair cats, along with Burmese and Scottish Fold variants, have been selected for flat-faced (brachycephalic) features. The welfare consequences include: brachycephalic obstructive airway syndrome (BOAS — breathing difficulty, exercise intolerance, heat intolerance), ocular disease (prominent eyes with impaired blinking causing corneal ulceration and chronic discomfort), dental crowding, skin fold dermatitis in nasal folds (requiring regular cleaning and prone to infection), and birthing difficulties (kittens with large, flat heads may require caesarean delivery). The severity of welfare compromise increases with the degree of facial flattening.
Scottish Fold cats carry a mutation causing cartilage abnormalities throughout the body, not just the folded ears that give the breed its name. Homozygous Scottish Fold cats (fold × fold breeding) invariably develop severe osteochondrodysplasia — painful joint disease affecting the legs, tail, and spine that causes profound chronic suffering. Even heterozygous cats may develop significant joint disease. The Scottish Fold is banned from breeding in some countries (Scotland, Germany, Australia) and has been removed from GCCF registration. Welfare organisations strongly advise against purchasing Scottish Fold cats.
Polycystic Kidney Disease (PKD) affects Persian and exotic shorthair cats — an autosomal dominant genetic condition causing progressive renal cysts and eventual kidney failure. PKD previously affected over 40% of Persian-derived cats before genetic testing became available. DNA testing of breeding cats and avoiding use of PKD-positive individuals has dramatically reduced prevalence in registered breeding lines. Testing availability through veterinary laboratories enables responsible breeding decisions.
Hypertrophic Cardiomyopathy (HCM — thickening of the heart muscle) is prevalent in Maine Coons, Ragdolls, and other breeds. Genetic mutations (MYBPC3) are identifiable in some breed lines, enabling testing. HCM causes cardiac failure, blood clots (aortic thromboembolism — acutely painful emergency), and sudden death. Breeding cats should be tested for available mutations (breed-specific recommendations) and screened by echocardiography before breeding. The welfare impact of HCM is severe — affected cats may die suddenly or experience painful cardiac emergencies.
Manx cats carry a dominant mutation causing taillessness or partial tail, caused by spinal defects. Homozygous Manx embryos (two copies of the Manx gene) are non-viable. Heterozygous cats develop variable spinal abnormalities — some are unaffected, others develop 'Manx Syndrome' including bowel and bladder dysfunction, progressive hind limb weakness, and spinal pain. The Cymric (longhaired Manx) and some other tailless breeds share these concerns.
Welfare-conscious breeding requires: health testing of breeding animals before use, selecting for functional conformation (cats should be able to breathe freely, blink fully, and move without pain), avoiding breeding from animals with heritable diseases, registering cats with genetic health test results with breed registries, and being transparent with buyers about breed health issues. Consumer choice drives change — buyers choosing cats from health-tested parents and avoiding breeds with structural problems signal market demand for welfare-conscious breeding.