Cat Polycystic Kidney Disease: Welfare and Management

Polycystic kidney disease (PKD) is a hereditary condition affecting Persian and related breeds that causes progressive kidney failure, requiring careful management and genetic screening.

Key Facts

PKD is caused by a dominant genetic mutation and affects approximately 40% of Persian cats worldwide
Fluid-filled cysts gradually replace functional kidney tissue, leading to chronic kidney disease
DNA testing can definitively identify carriers of the PKD1 mutation before breeding
Responsible breeding programs have significantly reduced PKD prevalence in screened populations
Most affected cats remain asymptomatic until middle age, when kidney function begins to decline noticeably
Management focuses on supporting remaining kidney function through diet, hydration, and medication

Welfare Considerations

PKD causes a long, slow decline in kidney function accompanied by increasing toxin accumulation, nausea, weight loss, and eventual uremic crisis. The welfare burden extends over years, with affected cats experiencing progressive malaise that is often difficult for owners to recognize as distinct from normal aging. The fact that PKD is entirely preventable through genetic testing and responsible breeding makes its continued prevalence a welfare failure that falls on breeders and breed registries.

What You Can Do

Only acquire Persian or related breed cats from breeders who DNA test for PKD and breed only PKD-negative cats
Request documentation of PKD test results for any Persian breed kitten before purchase
Have cats from unknown backgrounds and Persian mixes tested by PCR blood test
Conduct annual kidney function blood tests for all cats over seven years old, especially Persians
Feed a kidney-supportive diet early in disease progression as recommended by your veterinarian
Provide multiple sources of fresh water and consider a cat water fountain to encourage hydration