Jack Russell Terrier

Breed-Defining Chondrodysplasia

Breed-defining chondrodysplasia, also called short-leggedness, is a favorable phenotype found in some breeds. The well-known features of this breed-defining trait are caused by the FGF4 retrogene insertion. Short-leggedness caused by the FGF4 insertion is a desirable trait, and it is caused by different mutation than the undesired dwarfism causing genetic disorder found in some breeds, such as the Norwegian Elkhound.

New test content for Labrador Retrievers and Jack Russell Terriers

Genetic tests for mutations causing Congenital Myasthenic Syndrome in Labrador Retrievers and Jack Russell Terriers are now available in the MyDogDNA 2016 test panel. The disorder is considered severe, typically with an early onset of symptoms. See a more detailed description below.