Description:  Hair length is one of the most important morphological traits in many dog breeds. Differences in coat length are visible in various dog breeds, but for some, the breed standard allows only one coat length. In some breeds, the long or short variant is inacceptable. One such example is Pembroke Welsh Corgis where longhaired dogs (also called “fluffy”) are unacceptable.

Homozygote GG: the dog does not carry any specific variant for long hair – the dog has short hair

Heterozygote GT: the dog carries one copy of each variant of the gene – the dog is short-haired; if suitably crossed it can give long-haired offsprings

HomozygoteTT: the dog carries two same variants in the FGF5 gene – the dog is long-haired


Inheritance: autosomal recessive


Mutation: c.284G˃T in exon 1 of the FGF5 gene


Sample: EDTA whole blood (1.0 ml) or 2 buccal brushes. For official purposes, the confirmation of the dog’s identity by Veterinarian is recommended.


The analysis is suitable for the following breeds: Alaskan Malamutes, Bullmastiff, Chihuahuas, Cardigan Welsh Corgis, Dachshunds, Dalmatians, German Shepherd Dogs, Labrador Retrievers, Mastiffs, Norfolk Terrier, Norwich Terriers, Pembroke Welsh Corgis, Rottweilers, Schipperke, Shiba Inus, Weimaraners