The variant of the RALY gene leads to a receding of black hairs into a "saddle" shape on the back as the dog ages. This color pattern is referred to as a Saddle Tan.
RALY
Dominant Modifier
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https://pubmed.ncbi.nlm.nih.gov/23519866/ https://omia.org/OMIA000201/9615/ https://vgl.ucdavis.edu/test/agouti-dog
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