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To identify new variants in the FGF5 gene linked to the long-haired phenotype in dogs.

February 26, 2026AnimalsOpen Access

Discovery of Four New FGF5 Variants Causing Long Hair in the Dog

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To identify new variants in the FGF5 gene linked to the long-haired phenotype in dogs.
Genotyping long-haired dogs for known FGF5 variants Lh1 through Lh5
Analysis of the FGF5 gene coding region for novel variants
Comparison of genotypes in Tibetan Mastiffs
Identified four new variants in the FGF5 gene associated with long hair
Found a dog with an insertion variant near Lh4
Observed Lh1 variant in 11 of 24 Tibetan Mastiffs
Confirmed that new variants show Mendelian inheritance patterns

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Genotyping uncovers four novel FGF5 variants causing long hair in dogs, suggesting genetic complexity in this trait.

Everts et al. (2026) studied this question.

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