Modifier that determines whether a Frenchie displays a black mask, dilute mask, or no mask at all.
The E locus governs whether a Frenchie can express any dark hair on the face. Mask presence has always varied in the breed and is not itself a color — it is a modifier that layers over any color.
A black mask across the muzzle and often black ear tips. On dilute Frenchies the mask appears blue or lilac. On cream Frenchies (e/e) the mask is absent entirely.
Melanistic-mask allele.
At least one parent must pass Em.
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Cream Frenchies (e/e) genetically cannot produce a mask. Absence of a mask is a normal breed variation.
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