What It Is
Chondrodysplasia (CDPA) is an inherited short-limb skeletal trait associated with an FGF4 retrogene insertion on canine chromosome 18. It affects limb length and body proportions, but it is not the same as CDDY, the chromosome 12 FGF4 retrogene associated with premature disc degeneration and increased IVDD risk.
Also Called: CDPA; chromosome 18 FGF4 retrogene; breed-defining chondrodysplasia; short-limb trait
Abbreviation: CDPA
Breeds Affected: Coton de Tuléar
The Idiot-Proof Explanation
CDPA is one genetic reason a dog has shorter legs. It changes body proportions. It is not automatically the same as the disc-disease version, and that distinction matters because sloppy labels are how owners get bad advice wrapped in confidence.
What Causes It
CDPA is caused by an FGF4 retrogene insertion on chromosome 18. The inheritance pattern is generally described as autosomal dominant for the short-legged phenotype.
What Owners Actually Need To Know
The owner impact depends on the dog’s structure, breed context, and whether other orthopedic risks are also in the picture. Short legs alone are not the whole story. Watch the actual dog: movement, joint comfort, back comfort, weight control, and whether the structure is helping or hurting day-to-day life.