Trait overview

Dogs generally have five digits on the front paws and four digits on the hind paws. This is presumably due to an evolutionary adaptation that led to the loss of a digit on the hind paws. Preaxial polydactyly (PPD) in the hind limb is a developmental trait that causes the restoration of the fifth digit on the hind paw. This digit is often referred to as a dewclaw, and is known to be caused by a mutation in the LMBR1 gene.

Gene name(s)

LMBR1

Inheritance

Autosomal dominant

More common in the following breeds

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Citations

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2516088/