Pedigree of 33 Labrador Retrievers with mild disproportionate dwarfism.

Affected dogs are shown as filled symbols together with their laboratory identifiers. One dog with severely shortened legs and deformed paws that did not carry the disease-associated haplotype is highlighted in red (see also Figure S1). Three dogs that could not unambiguously be classified are indicated with question marks. Please note that due to space restrictions many non-affected littermates of the affected dogs are not shown in this pedigree. All affected dogs in this pedigree can be traced to a common ancestor in their paternal and maternal ancestry, respectively (arrow). This male dog was born in 1966 and may represent the founder of SD2.